Finding the Fourth Proportional to 1,078.00, 1,617.29 and 429.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.00 : 1,617.29 = 429.19 : x
2. Step 2: Convert to fraction form
   1,078.00/1,617.29 = 429.19/x
3. Step 3: Cross multiply
   1,078.00x = 1,617.29 × 429.19
4. Step 4: Simplify right side
   1,078.00x = 694,116.61
5. Step 5: Solve for x
   x = 694,116.61/1,078.00
6. Step 6: Final answer
   x = 643.90