Finding the Fourth Proportional to 22,520.58, 31,079.60 and 12,961.92

Step by Step Solution

1. Step 1: Write the proportion equation
   22,520.58 : 31,079.60 = 12,961.92 : x
2. Step 2: Convert to fraction form
   22,520.58/31,079.60 = 12,961.92/x
3. Step 3: Cross multiply
   22,520.58x = 31,079.60 × 12,961.92
4. Step 4: Simplify right side
   22,520.58x = 402,851,288.83
5. Step 5: Solve for x
   x = 402,851,288.83/22,520.58
6. Step 6: Final answer
   x = 17,888.14