Finding the Fourth Proportional to 31,763.39, 47,641.43 and 8,391.65

Step by Step Solution

1. Step 1: Write the proportion equation
   31,763.39 : 47,641.43 = 8,391.65 : x
2. Step 2: Convert to fraction form
   31,763.39/47,641.43 = 8,391.65/x
3. Step 3: Cross multiply
   31,763.39x = 47,641.43 × 8,391.65
4. Step 4: Simplify right side
   31,763.39x = 399,789,925.89
5. Step 5: Solve for x
   x = 399,789,925.89/31,763.39
6. Step 6: Final answer
   x = 12,586.50