Finding the Fourth Proportional to 22,492.32, 31,039.98 and 12,420.90

Step by Step Solution

1. Step 1: Write the proportion equation
   22,492.32 : 31,039.98 = 12,420.90 : x
2. Step 2: Convert to fraction form
   22,492.32/31,039.98 = 12,420.90/x
3. Step 3: Cross multiply
   22,492.32x = 31,039.98 × 12,420.90
4. Step 4: Simplify right side
   22,492.32x = 385,544,487.58
5. Step 5: Solve for x
   x = 385,544,487.58/22,492.32
6. Step 6: Final answer
   x = 17,141.16