Finding the Fourth Proportional to 57,120.63, 78,835.83 and 39,200.91

Step by Step Solution

1. Step 1: Write the proportion equation
   57,120.63 : 78,835.83 = 39,200.91 : x
2. Step 2: Convert to fraction form
   57,120.63/78,835.83 = 39,200.91/x
3. Step 3: Cross multiply
   57,120.63x = 78,835.83 × 39,200.91
4. Step 4: Simplify right side
   57,120.63x = 3,090,436,276.61
5. Step 5: Solve for x
   x = 3,090,436,276.61/57,120.63
6. Step 6: Final answer
   x = 54,103.68