Finding the Fourth Proportional to 57,085.60, 78,775.32 and 31,591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,085.60 : 78,775.32 = 31,591.50 : x
2. Step 2: Convert to fraction form
   57,085.60/78,775.32 = 31,591.50/x
3. Step 3: Cross multiply
   57,085.60x = 78,775.32 × 31,591.50
4. Step 4: Simplify right side
   57,085.60x = 2,488,630,521.78
5. Step 5: Solve for x
   x = 2,488,630,521.78/57,085.60
6. Step 6: Final answer
   x = 43,594.72