Finding the Fourth Proportional to 22,476.98, 31,018.56 and 12,405.90

Step by Step Solution

1. Step 1: Write the proportion equation
   22,476.98 : 31,018.56 = 12,405.90 : x
2. Step 2: Convert to fraction form
   22,476.98/31,018.56 = 12,405.90/x
3. Step 3: Cross multiply
   22,476.98x = 31,018.56 × 12,405.90
4. Step 4: Simplify right side
   22,476.98x = 384,813,153.50
5. Step 5: Solve for x
   x = 384,813,153.50/22,476.98
6. Step 6: Final answer
   x = 17,120.32