Finding the Fourth Proportional to 9,992.80, 13,790.18 and 5,516.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,992.80 : 13,790.18 = 5,516.55 : x
2. Step 2: Convert to fraction form
   9,992.80/13,790.18 = 5,516.55/x
3. Step 3: Cross multiply
   9,992.80x = 13,790.18 × 5,516.55
4. Step 4: Simplify right side
   9,992.80x = 76,074,262.30
5. Step 5: Solve for x
   x = 76,074,262.30/9,992.80
6. Step 6: Final answer
   x = 7,612.91