Finding the Fourth Proportional to 31,123.20, 46,670.76 and 8,931.54

Step by Step Solution

1. Step 1: Write the proportion equation
   31,123.20 : 46,670.76 = 8,931.54 : x
2. Step 2: Convert to fraction form
   31,123.20/46,670.76 = 8,931.54/x
3. Step 3: Cross multiply
   31,123.20x = 46,670.76 × 8,931.54
4. Step 4: Simplify right side
   31,123.20x = 416,841,759.77
5. Step 5: Solve for x
   x = 416,841,759.77/31,123.20
6. Step 6: Final answer
   x = 13,393.28