Finding the Fourth Proportional to 22,492.45, 31,039.42 and 12,420.81

Step by Step Solution

1. Step 1: Write the proportion equation
   22,492.45 : 31,039.42 = 12,420.81 : x
2. Step 2: Convert to fraction form
   22,492.45/31,039.42 = 12,420.81/x
3. Step 3: Cross multiply
   22,492.45x = 31,039.42 × 12,420.81
4. Step 4: Simplify right side
   22,492.45x = 385,534,521.03
5. Step 5: Solve for x
   x = 385,534,521.03/22,492.45
6. Step 6: Final answer
   x = 17,140.62