Finding the Fourth Proportional to 9,992.31, 13,789.62 and 5,515.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,992.31 : 13,789.62 = 5,515.98 : x
2. Step 2: Convert to fraction form
   9,992.31/13,789.62 = 5,515.98/x
3. Step 3: Cross multiply
   9,992.31x = 13,789.62 × 5,515.98
4. Step 4: Simplify right side
   9,992.31x = 76,063,268.13
5. Step 5: Solve for x
   x = 76,063,268.13/9,992.31
6. Step 6: Final answer
   x = 7,612.18