Finding the Fourth Proportional to 1,078.50, 1,618.04 and 429.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.50 : 1,618.04 = 429.69 : x
2. Step 2: Convert to fraction form
   1,078.50/1,618.04 = 429.69/x
3. Step 3: Cross multiply
   1,078.50x = 1,618.04 × 429.69
4. Step 4: Simplify right side
   1,078.50x = 695,247.52
5. Step 5: Solve for x
   x = 695,247.52/1,078.50
6. Step 6: Final answer
   x = 644.65