Finding the Fourth Proportional to 78,061.29, 117,092.58 and 66,743.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,061.29 : 117,092.58 = 66,743.31 : x
2. Step 2: Convert to fraction form
   78,061.29/117,092.58 = 66,743.31/x
3. Step 3: Cross multiply
   78,061.29x = 117,092.58 × 66,743.31
4. Step 4: Simplify right side
   78,061.29x = 7,815,146,260.12
5. Step 5: Solve for x
   x = 7,815,146,260.12/78,061.29
6. Step 6: Final answer
   x = 100,115.51