Finding the Fourth Proportional to 9,977.32, 13,768.54 and 5,728.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,977.32 : 13,768.54 = 5,728.47 : x
2. Step 2: Convert to fraction form
   9,977.32/13,768.54 = 5,728.47/x
3. Step 3: Cross multiply
   9,977.32x = 13,768.54 × 5,728.47
4. Step 4: Simplify right side
   9,977.32x = 78,872,668.33
5. Step 5: Solve for x
   x = 78,872,668.33/9,977.32
6. Step 6: Final answer
   x = 7,905.20