Finding the Fourth Proportional to 22,520.53, 31,081.42 and 12,960.22

Step by Step Solution

1. Step 1: Write the proportion equation
   22,520.53 : 31,081.42 = 12,960.22 : x
2. Step 2: Convert to fraction form
   22,520.53/31,081.42 = 12,960.22/x
3. Step 3: Cross multiply
   22,520.53x = 31,081.42 × 12,960.22
4. Step 4: Simplify right side
   22,520.53x = 402,822,041.11
5. Step 5: Solve for x
   x = 402,822,041.11/22,520.53
6. Step 6: Final answer
   x = 17,886.88