Finding the Fourth Proportional to 111,057.39, 166,485.29 and 57,686.99

Step by Step Solution

1. Step 1: Write the proportion equation
   111,057.39 : 166,485.29 = 57,686.99 : x
2. Step 2: Convert to fraction form
   111,057.39/166,485.29 = 57,686.99/x
3. Step 3: Cross multiply
   111,057.39x = 166,485.29 × 57,686.99
4. Step 4: Simplify right side
   111,057.39x = 9,604,034,138.52
5. Step 5: Solve for x
   x = 9,604,034,138.52/111,057.39
6. Step 6: Final answer
   x = 86,478.12