Finding the Fourth Proportional to 7,978.24, 11,009.58 and 6,091.15

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.24 : 11,009.58 = 6,091.15 : x
2. Step 2: Convert to fraction form
   7,978.24/11,009.58 = 6,091.15/x
3. Step 3: Cross multiply
   7,978.24x = 11,009.58 × 6,091.15
4. Step 4: Simplify right side
   7,978.24x = 67,061,003.22
5. Step 5: Solve for x
   x = 67,061,003.22/7,978.24
6. Step 6: Final answer
   x = 8,405.49