Finding the Fourth Proportional to 57,070.60, 78,757.69 and 31,920.10

Step by Step Solution

1. Step 1: Write the proportion equation
   57,070.60 : 78,757.69 = 31,920.10 : x
2. Step 2: Convert to fraction form
   57,070.60/78,757.69 = 31,920.10/x
3. Step 3: Cross multiply
   57,070.60x = 78,757.69 × 31,920.10
4. Step 4: Simplify right side
   57,070.60x = 2,513,953,063.87
5. Step 5: Solve for x
   x = 2,513,953,063.87/57,070.60
6. Step 6: Final answer
   x = 44,049.88