Finding the Fourth Proportional to 8,977.98, 12,388.98 and 5,620.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,977.98 : 12,388.98 = 5,620.64 : x
2. Step 2: Convert to fraction form
   8,977.98/12,388.98 = 5,620.64/x
3. Step 3: Cross multiply
   8,977.98x = 12,388.98 × 5,620.64
4. Step 4: Simplify right side
   8,977.98x = 69,633,996.55
5. Step 5: Solve for x
   x = 69,633,996.55/8,977.98
6. Step 6: Final answer
   x = 7,756.09