Finding the Fourth Proportional to 61,540.50, 91,827.72 and 57,778.86

Step by Step Solution

1. Step 1: Write the proportion equation
   61,540.50 : 91,827.72 = 57,778.86 : x
2. Step 2: Convert to fraction form
   61,540.50/91,827.72 = 57,778.86/x
3. Step 3: Cross multiply
   61,540.50x = 91,827.72 × 57,778.86
4. Step 4: Simplify right side
   61,540.50x = 5,305,700,978.00
5. Step 5: Solve for x
   x = 5,305,700,978.00/61,540.50
6. Step 6: Final answer
   x = 86,214.79