Finding the Fourth Proportional to 3,899.88, 5,849.70 and 978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.88 : 5,849.70 = 978.18 : x
2. Step 2: Convert to fraction form
   3,899.88/5,849.70 = 978.18/x
3. Step 3: Cross multiply
   3,899.88x = 5,849.70 × 978.18
4. Step 4: Simplify right side
   3,899.88x = 5,722,059.55
5. Step 5: Solve for x
   x = 5,722,059.55/3,899.88
6. Step 6: Final answer
   x = 1,467.24