Finding the Fourth Proportional to 1,398,638,280.48, 1,930,126,991.83 and 772,111,856.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398,638,280.48 : 1,930,126,991.83 = 772,111,856.76 : x
2. Step 2: Convert to fraction form
   1,398,638,280.48/1,930,126,991.83 = 772,111,856.76/x
3. Step 3: Cross multiply
   1,398,638,280.48x = 1,930,126,991.83 × 772,111,856.76
4. Step 4: Simplify right side
   1,398,638,280.48x = 1,490,273,935,441,134,848
5. Step 5: Solve for x
   x = 1,490,273,935,441,134,848/1,398,638,280.48
6. Step 6: Final answer
   x = 1,065,517,765.56