Finding the Fourth Proportional to 22,564.67, 31,138.88 and 12,492.90

Step by Step Solution

1. Step 1: Write the proportion equation
   22,564.67 : 31,138.88 = 12,492.90 : x
2. Step 2: Convert to fraction form
   22,564.67/31,138.88 = 12,492.90/x
3. Step 3: Cross multiply
   22,564.67x = 31,138.88 × 12,492.90
4. Step 4: Simplify right side
   22,564.67x = 389,014,734.72
5. Step 5: Solve for x
   x = 389,014,734.72/22,564.67
6. Step 6: Final answer
   x = 17,239.99