Finding the Fourth Proportional to 22,691.34, 31,311.65 and 12,618.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,691.34 : 31,311.65 = 12,618.16 : x
2. Step 2: Convert to fraction form
   22,691.34/31,311.65 = 12,618.16/x
3. Step 3: Cross multiply
   22,691.34x = 31,311.65 × 12,618.16
4. Step 4: Simplify right side
   22,691.34x = 395,095,362.83
5. Step 5: Solve for x
   x = 395,095,362.83/22,691.34
6. Step 6: Final answer
   x = 17,411.72