Finding the Fourth Proportional to 9,991.26, 13,787.67 and 5,514.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,991.26 : 13,787.67 = 5,514.69 : x
2. Step 2: Convert to fraction form
   9,991.26/13,787.67 = 5,514.69/x
3. Step 3: Cross multiply
   9,991.26x = 13,787.67 × 5,514.69
4. Step 4: Simplify right side
   9,991.26x = 76,034,725.87
5. Step 5: Solve for x
   x = 76,034,725.87/9,991.26
6. Step 6: Final answer
   x = 7,610.12