Finding the Fourth Proportional to 10,134.78, 15,202.20 and 3,978.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,134.78 : 15,202.20 = 3,978.78 : x
2. Step 2: Convert to fraction form
   10,134.78/15,202.20 = 3,978.78/x
3. Step 3: Cross multiply
   10,134.78x = 15,202.20 × 3,978.78
4. Step 4: Simplify right side
   10,134.78x = 60,486,209.32
5. Step 5: Solve for x
   x = 60,486,209.32/10,134.78
6. Step 6: Final answer
   x = 5,968.18