Finding the Fourth Proportional to 11,886.12, 16,399.15 and 7,907.91

Step by Step Solution

1. Step 1: Write the proportion equation
   11,886.12 : 16,399.15 = 7,907.91 : x
2. Step 2: Convert to fraction form
   11,886.12/16,399.15 = 7,907.91/x
3. Step 3: Cross multiply
   11,886.12x = 16,399.15 × 7,907.91
4. Step 4: Simplify right side
   11,886.12x = 129,683,002.28
5. Step 5: Solve for x
   x = 129,683,002.28/11,886.12
6. Step 6: Final answer
   x = 10,910.45