Finding the Fourth Proportional to 123,510.63, 170,425.31 and 71,839.17

Step by Step Solution

1. Step 1: Write the proportion equation
   123,510.63 : 170,425.31 = 71,839.17 : x
2. Step 2: Convert to fraction form
   123,510.63/170,425.31 = 71,839.17/x
3. Step 3: Cross multiply
   123,510.63x = 170,425.31 × 71,839.17
4. Step 4: Simplify right side
   123,510.63x = 12,243,212,458.20
5. Step 5: Solve for x
   x = 12,243,212,458.20/123,510.63
6. Step 6: Final answer
   x = 99,126.79