Finding the Fourth Proportional to 978.90, 1,351.17 and 684.27

Step by Step Solution

1. Step 1: Write the proportion equation
   978.90 : 1,351.17 = 684.27 : x
2. Step 2: Convert to fraction form
   978.90/1,351.17 = 684.27/x
3. Step 3: Cross multiply
   978.90x = 1,351.17 × 684.27
4. Step 4: Simplify right side
   978.90x = 924,565.10
5. Step 5: Solve for x
   x = 924,565.10/978.90
6. Step 6: Final answer
   x = 944.49