Finding the Fourth Proportional to 10,990.89, 16,485.12 and 7,899.93

Step by Step Solution

1. Step 1: Write the proportion equation
   10,990.89 : 16,485.12 = 7,899.93 : x
2. Step 2: Convert to fraction form
   10,990.89/16,485.12 = 7,899.93/x
3. Step 3: Cross multiply
   10,990.89x = 16,485.12 × 7,899.93
4. Step 4: Simplify right side
   10,990.89x = 130,231,294.04
5. Step 5: Solve for x
   x = 130,231,294.04/10,990.89
6. Step 6: Final answer
   x = 11,849.02