Finding the Fourth Proportional to 9,992.03, 13,789.02 and 5,515.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,992.03 : 13,789.02 = 5,515.78 : x
2. Step 2: Convert to fraction form
   9,992.03/13,789.02 = 5,515.78/x
3. Step 3: Cross multiply
   9,992.03x = 13,789.02 × 5,515.78
4. Step 4: Simplify right side
   9,992.03x = 76,057,221.42
5. Step 5: Solve for x
   x = 76,057,221.42/9,992.03
6. Step 6: Final answer
   x = 7,611.79