Finding the Fourth Proportional to 3,899.99, 5,849.85 and 978.32

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.99 : 5,849.85 = 978.32 : x
2. Step 2: Convert to fraction form
   3,899.99/5,849.85 = 978.32/x
3. Step 3: Cross multiply
   3,899.99x = 5,849.85 × 978.32
4. Step 4: Simplify right side
   3,899.99x = 5,723,025.25
5. Step 5: Solve for x
   x = 5,723,025.25/3,899.99
6. Step 6: Final answer
   x = 1,467.45