Finding the Fourth Proportional to 55,640.64, 76,790.52 and 31,770.72

Step by Step Solution

1. Step 1: Write the proportion equation
   55,640.64 : 76,790.52 = 31,770.72 : x
2. Step 2: Convert to fraction form
   55,640.64/76,790.52 = 31,770.72/x
3. Step 3: Cross multiply
   55,640.64x = 76,790.52 × 31,770.72
4. Step 4: Simplify right side
   55,640.64x = 2,439,690,109.57
5. Step 5: Solve for x
   x = 2,439,690,109.57/55,640.64
6. Step 6: Final answer
   x = 43,847.27