Finding the Fourth Proportional to 22,492.06, 31,038.42 and 12,420.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,492.06 : 31,038.42 = 12,420.31 : x
2. Step 2: Convert to fraction form
   22,492.06/31,038.42 = 12,420.31/x
3. Step 3: Cross multiply
   22,492.06x = 31,038.42 × 12,420.31
4. Step 4: Simplify right side
   22,492.06x = 385,506,798.31
5. Step 5: Solve for x
   x = 385,506,798.31/22,492.06
6. Step 6: Final answer
   x = 17,139.68