Finding the Fourth Proportional to 22,886.10, 31,585.86 and 12,815.10

Step by Step Solution

1. Step 1: Write the proportion equation
   22,886.10 : 31,585.86 = 12,815.10 : x
2. Step 2: Convert to fraction form
   22,886.10/31,585.86 = 12,815.10/x
3. Step 3: Cross multiply
   22,886.10x = 31,585.86 × 12,815.10
4. Step 4: Simplify right side
   22,886.10x = 404,775,954.49
5. Step 5: Solve for x
   x = 404,775,954.49/22,886.10
6. Step 6: Final answer
   x = 17,686.54