Finding the Fourth Proportional to 11,820.29, 16,309.62 and 8,986.91

Step by Step Solution

1. Step 1: Write the proportion equation
   11,820.29 : 16,309.62 = 8,986.91 : x
2. Step 2: Convert to fraction form
   11,820.29/16,309.62 = 8,986.91/x
3. Step 3: Cross multiply
   11,820.29x = 16,309.62 × 8,986.91
4. Step 4: Simplify right side
   11,820.29x = 146,573,005.53
5. Step 5: Solve for x
   x = 146,573,005.53/11,820.29
6. Step 6: Final answer
   x = 12,400.12