Finding the Fourth Proportional to 123,499.88, 170,429.43 and 66,911.25

Step by Step Solution

1. Step 1: Write the proportion equation
   123,499.88 : 170,429.43 = 66,911.25 : x
2. Step 2: Convert to fraction form
   123,499.88/170,429.43 = 66,911.25/x
3. Step 3: Cross multiply
   123,499.88x = 170,429.43 × 66,911.25
4. Step 4: Simplify right side
   123,499.88x = 11,403,646,198.09
5. Step 5: Solve for x
   x = 11,403,646,198.09/123,499.88
6. Step 6: Final answer
   x = 92,337.31