Finding the Fourth Proportional to 6,520.04, 8,988.72 and 4,128.80

Step by Step Solution

1. Step 1: Write the proportion equation
   6,520.04 : 8,988.72 = 4,128.80 : x
2. Step 2: Convert to fraction form
   6,520.04/8,988.72 = 4,128.80/x
3. Step 3: Cross multiply
   6,520.04x = 8,988.72 × 4,128.80
4. Step 4: Simplify right side
   6,520.04x = 37,112,627.14
5. Step 5: Solve for x
   x = 37,112,627.14/6,520.04
6. Step 6: Final answer
   x = 5,692.09