Finding the Fourth Proportional to 10,978.44, 15,155.88 and 6,789.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.44 : 15,155.88 = 6,789.12 : x
2. Step 2: Convert to fraction form
   10,978.44/15,155.88 = 6,789.12/x
3. Step 3: Cross multiply
   10,978.44x = 15,155.88 × 6,789.12
4. Step 4: Simplify right side
   10,978.44x = 102,895,088.03
5. Step 5: Solve for x
   x = 102,895,088.03/10,978.44
6. Step 6: Final answer
   x = 9,372.47