Finding the Fourth Proportional to 57,899.48, 86,799.98 and 55,143.86

Step by Step Solution

1. Step 1: Write the proportion equation
   57,899.48 : 86,799.98 = 55,143.86 : x
2. Step 2: Convert to fraction form
   57,899.48/86,799.98 = 55,143.86/x
3. Step 3: Cross multiply
   57,899.48x = 86,799.98 × 55,143.86
4. Step 4: Simplify right side
   57,899.48x = 4,786,485,945.12
5. Step 5: Solve for x
   x = 4,786,485,945.12/57,899.48
6. Step 6: Final answer
   x = 82,668.89