Finding the Fourth Proportional to 100,783.31, 139,034.43 and 64,984.82

Step by Step Solution

1. Step 1: Write the proportion equation
   100,783.31 : 139,034.43 = 64,984.82 : x
2. Step 2: Convert to fraction form
   100,783.31/139,034.43 = 64,984.82/x
3. Step 3: Cross multiply
   100,783.31x = 139,034.43 × 64,984.82
4. Step 4: Simplify right side
   100,783.31x = 9,035,126,712.18
5. Step 5: Solve for x
   x = 9,035,126,712.18/100,783.31
6. Step 6: Final answer
   x = 89,649.04