Finding the Fourth Proportional to 9,990.56, 13,787.12 and 5,514.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.56 : 13,787.12 = 5,514.50 : x
2. Step 2: Convert to fraction form
   9,990.56/13,787.12 = 5,514.50/x
3. Step 3: Cross multiply
   9,990.56x = 13,787.12 × 5,514.50
4. Step 4: Simplify right side
   9,990.56x = 76,028,976.73
5. Step 5: Solve for x
   x = 76,028,976.73/9,990.56
6. Step 6: Final answer
   x = 7,610.09