Finding the Fourth Proportional to 8,757.86, 12,090.39 and 5,402.48

Step by Step Solution

1. Step 1: Write the proportion equation
   8,757.86 : 12,090.39 = 5,402.48 : x
2. Step 2: Convert to fraction form
   8,757.86/12,090.39 = 5,402.48/x
3. Step 3: Cross multiply
   8,757.86x = 12,090.39 × 5,402.48
4. Step 4: Simplify right side
   8,757.86x = 65,318,029.72
5. Step 5: Solve for x
   x = 65,318,029.72/8,757.86
6. Step 6: Final answer
   x = 7,458.22