Finding the Fourth Proportional to 6,632.55, 9,150.57 and 3,978.99

Step by Step Solution

1. Step 1: Write the proportion equation
   6,632.55 : 9,150.57 = 3,978.99 : x
2. Step 2: Convert to fraction form
   6,632.55/9,150.57 = 3,978.99/x
3. Step 3: Cross multiply
   6,632.55x = 9,150.57 × 3,978.99
4. Step 4: Simplify right side
   6,632.55x = 36,410,026.52
5. Step 5: Solve for x
   x = 36,410,026.52/6,632.55
6. Step 6: Final answer
   x = 5,489.60