Finding the Fourth Proportional to 12,451.50, 18,631.10 and 9,978.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,451.50 : 18,631.10 = 9,978.82 : x
2. Step 2: Convert to fraction form
   12,451.50/18,631.10 = 9,978.82/x
3. Step 3: Cross multiply
   12,451.50x = 18,631.10 × 9,978.82
4. Step 4: Simplify right side
   12,451.50x = 185,916,393.30
5. Step 5: Solve for x
   x = 185,916,393.30/12,451.50
6. Step 6: Final answer
   x = 14,931.24