Finding the Fourth Proportional to 43,551, 65,327.31 and 12,387.06

Step by Step Solution

1. Step 1: Write the proportion equation
   43,551 : 65,327.31 = 12,387.06 : x
2. Step 2: Convert to fraction form
   43,551/65,327.31 = 12,387.06/x
3. Step 3: Cross multiply
   43,551x = 65,327.31 × 12,387.06
4. Step 4: Simplify right side
   43,551x = 809,213,308.61
5. Step 5: Solve for x
   x = 809,213,308.61/43,551
6. Step 6: Final answer
   x = 18,580.82