Finding the Fourth Proportional to 123,851.16, 170,985.42 and 81,532.71

Step by Step Solution

1. Step 1: Write the proportion equation
   123,851.16 : 170,985.42 = 81,532.71 : x
2. Step 2: Convert to fraction form
   123,851.16/170,985.42 = 81,532.71/x
3. Step 3: Cross multiply
   123,851.16x = 170,985.42 × 81,532.71
4. Step 4: Simplify right side
   123,851.16x = 13,940,904,663.09
5. Step 5: Solve for x
   x = 13,940,904,663.09/123,851.16
6. Step 6: Final answer
   x = 112,561.76