Finding the Fourth Proportional to 57,898.48, 86,798.49 and 55,142.86

Step by Step Solution

1. Step 1: Write the proportion equation
   57,898.48 : 86,798.49 = 55,142.86 : x
2. Step 2: Convert to fraction form
   57,898.48/86,798.49 = 55,142.86/x
3. Step 3: Cross multiply
   57,898.48x = 86,798.49 × 55,142.86
4. Step 4: Simplify right side
   57,898.48x = 4,786,316,982.28
5. Step 5: Solve for x
   x = 4,786,316,982.28/57,898.48
6. Step 6: Final answer
   x = 82,667.40