Finding the Fourth Proportional to 9,978.62, 13,776.12 and 6,626.03

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.62 : 13,776.12 = 6,626.03 : x
2. Step 2: Convert to fraction form
   9,978.62/13,776.12 = 6,626.03/x
3. Step 3: Cross multiply
   9,978.62x = 13,776.12 × 6,626.03
4. Step 4: Simplify right side
   9,978.62x = 91,280,915.52
5. Step 5: Solve for x
   x = 91,280,915.52/9,978.62
6. Step 6: Final answer
   x = 9,147.65