Finding the Fourth Proportional to 22,492.47, 31,039.74 and 12,420.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,492.47 : 31,039.74 = 12,420.72 : x
2. Step 2: Convert to fraction form
   22,492.47/31,039.74 = 12,420.72/x
3. Step 3: Cross multiply
   22,492.47x = 31,039.74 × 12,420.72
4. Step 4: Simplify right side
   22,492.47x = 385,535,919.41
5. Step 5: Solve for x
   x = 385,535,919.41/22,492.47
6. Step 6: Final answer
   x = 17,140.67