Finding the Fourth Proportional to 22,893.43, 31,591.32 and 12,820.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,893.43 : 31,591.32 = 12,820.15 : x
2. Step 2: Convert to fraction form
   22,893.43/31,591.32 = 12,820.15/x
3. Step 3: Cross multiply
   22,893.43x = 31,591.32 × 12,820.15
4. Step 4: Simplify right side
   22,893.43x = 405,005,461.10
5. Step 5: Solve for x
   x = 405,005,461.10/22,893.43
6. Step 6: Final answer
   x = 17,690.90