Finding the Fourth Proportional to 11,900.16, 16,415.55 and 8,122.13

Step by Step Solution

1. Step 1: Write the proportion equation
   11,900.16 : 16,415.55 = 8,122.13 : x
2. Step 2: Convert to fraction form
   11,900.16/16,415.55 = 8,122.13/x
3. Step 3: Cross multiply
   11,900.16x = 16,415.55 × 8,122.13
4. Step 4: Simplify right side
   11,900.16x = 133,329,149.04
5. Step 5: Solve for x
   x = 133,329,149.04/11,900.16
6. Step 6: Final answer
   x = 11,203.98