Finding the Fourth Proportional to 209,721.56, 314,632.02 and 91,414.04

Step by Step Solution

1. Step 1: Write the proportion equation
   209,721.56 : 314,632.02 = 91,414.04 : x
2. Step 2: Convert to fraction form
   209,721.56/314,632.02 = 91,414.04/x
3. Step 3: Cross multiply
   209,721.56x = 314,632.02 × 91,414.04
4. Step 4: Simplify right side
   209,721.56x = 28,761,784,061.56
5. Step 5: Solve for x
   x = 28,761,784,061.56/209,721.56
6. Step 6: Final answer
   x = 137,142.71