Finding the Fourth Proportional to 12,363.88, 18,435.54 and 10,990.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,363.88 : 18,435.54 = 10,990.12 : x
2. Step 2: Convert to fraction form
   12,363.88/18,435.54 = 10,990.12/x
3. Step 3: Cross multiply
   12,363.88x = 18,435.54 × 10,990.12
4. Step 4: Simplify right side
   12,363.88x = 202,608,796.86
5. Step 5: Solve for x
   x = 202,608,796.86/12,363.88
6. Step 6: Final answer
   x = 16,387.15