Finding the Fourth Proportional to 2,438.71, 3,658.04 and 978.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,438.71 : 3,658.04 = 978.89 : x
2. Step 2: Convert to fraction form
   2,438.71/3,658.04 = 978.89/x
3. Step 3: Cross multiply
   2,438.71x = 3,658.04 × 978.89
4. Step 4: Simplify right side
   2,438.71x = 3,580,795.59
5. Step 5: Solve for x
   x = 3,580,795.59/2,438.71
6. Step 6: Final answer
   x = 1,468.32