Finding the Fourth Proportional to 9,991.06, 13,787.47 and 5,514.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,991.06 : 13,787.47 = 5,514.55 : x
2. Step 2: Convert to fraction form
   9,991.06/13,787.47 = 5,514.55/x
3. Step 3: Cross multiply
   9,991.06x = 13,787.47 × 5,514.55
4. Step 4: Simplify right side
   9,991.06x = 76,031,692.69
5. Step 5: Solve for x
   x = 76,031,692.69/9,991.06
6. Step 6: Final answer
   x = 7,609.97