Finding the Fourth Proportional to 22,890.50, 31,587.32 and 12,681.18

Step by Step Solution

1. Step 1: Write the proportion equation
   22,890.50 : 31,587.32 = 12,681.18 : x
2. Step 2: Convert to fraction form
   22,890.50/31,587.32 = 12,681.18/x
3. Step 3: Cross multiply
   22,890.50x = 31,587.32 × 12,681.18
4. Step 4: Simplify right side
   22,890.50x = 400,564,522.34
5. Step 5: Solve for x
   x = 400,564,522.34/22,890.50
6. Step 6: Final answer
   x = 17,499.16