Finding the Fourth Proportional to 6,629.95, 9,150.06 and 3,978.01

Step by Step Solution

1. Step 1: Write the proportion equation
   6,629.95 : 9,150.06 = 3,978.01 : x
2. Step 2: Convert to fraction form
   6,629.95/9,150.06 = 3,978.01/x
3. Step 3: Cross multiply
   6,629.95x = 9,150.06 × 3,978.01
4. Step 4: Simplify right side
   6,629.95x = 36,399,030.18
5. Step 5: Solve for x
   x = 36,399,030.18/6,629.95
6. Step 6: Final answer
   x = 5,490.09