Finding the Fourth Proportional to 22,491.72, 31,038.82 and 12,420.14

Step by Step Solution

1. Step 1: Write the proportion equation
   22,491.72 : 31,038.82 = 12,420.14 : x
2. Step 2: Convert to fraction form
   22,491.72/31,038.82 = 12,420.14/x
3. Step 3: Cross multiply
   22,491.72x = 31,038.82 × 12,420.14
4. Step 4: Simplify right side
   22,491.72x = 385,506,489.83
5. Step 5: Solve for x
   x = 385,506,489.83/22,491.72
6. Step 6: Final answer
   x = 17,139.93