Finding the Fourth Proportional to 22,513.78, 31,068.15 and 12,956.75

Step by Step Solution

1. Step 1: Write the proportion equation
   22,513.78 : 31,068.15 = 12,956.75 : x
2. Step 2: Convert to fraction form
   22,513.78/31,068.15 = 12,956.75/x
3. Step 3: Cross multiply
   22,513.78x = 31,068.15 × 12,956.75
4. Step 4: Simplify right side
   22,513.78x = 402,542,252.51
5. Step 5: Solve for x
   x = 402,542,252.51/22,513.78
6. Step 6: Final answer
   x = 17,879.82