Finding the Fourth Proportional to 9,777.11, 14,669.91 and 8,387.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,777.11 : 14,669.91 = 8,387.15 : x
2. Step 2: Convert to fraction form
   9,777.11/14,669.91 = 8,387.15/x
3. Step 3: Cross multiply
   9,777.11x = 14,669.91 × 8,387.15
4. Step 4: Simplify right side
   9,777.11x = 123,038,662.31
5. Step 5: Solve for x
   x = 123,038,662.31/9,777.11
6. Step 6: Final answer
   x = 12,584.37