Finding the Fourth Proportional to 22,528.10, 31,087.89 and 12,455.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,528.10 : 31,087.89 = 12,455.88 : x
2. Step 2: Convert to fraction form
   22,528.10/31,087.89 = 12,455.88/x
3. Step 3: Cross multiply
   22,528.10x = 31,087.89 × 12,455.88
4. Step 4: Simplify right side
   22,528.10x = 387,227,027.29
5. Step 5: Solve for x
   x = 387,227,027.29/22,528.10
6. Step 6: Final answer
   x = 17,188.63