Finding the Third Proportional to 780,288 and 1,140,840

Step by Step Solution

1. Step 1: Write the proportion equation
   780,288 : 1,140,840 = 1,140,840 : x
2. Step 2: Convert to fraction form
   780,288/1,140,840 = 1,140,840/x
3. Step 3: Cross multiply
   780,288x = 1,140,840 × 1,140,840
4. Step 4: Simplify right side
   780,288x = 1,301,515,905,600
5. Step 5: Solve for x
   x = 1,301,515,905,600/780,288
6. Step 6: Final answer
   x = 1,667,994.26