Finding the Fourth Proportional to 9,980.42, 13,772.46 and 5,728.52

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.42 : 13,772.46 = 5,728.52 : x
2. Step 2: Convert to fraction form
   9,980.42/13,772.46 = 5,728.52/x
3. Step 3: Cross multiply
   9,980.42x = 13,772.46 × 5,728.52
4. Step 4: Simplify right side
   9,980.42x = 78,895,868.47
5. Step 5: Solve for x
   x = 78,895,868.47/9,980.42
6. Step 6: Final answer
   x = 7,905.07