Finding the Fourth Proportional to 8,100.87, 11,177.22 and 5,406.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,100.87 : 11,177.22 = 5,406.78 : x
2. Step 2: Convert to fraction form
   8,100.87/11,177.22 = 5,406.78/x
3. Step 3: Cross multiply
   8,100.87x = 11,177.22 × 5,406.78
4. Step 4: Simplify right side
   8,100.87x = 60,432,769.55
5. Step 5: Solve for x
   x = 60,432,769.55/8,100.87
6. Step 6: Final answer
   x = 7,460.03