Finding the Fourth Proportional to 1,046.98, 1,569.86 and 429.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,046.98 : 1,569.86 = 429.98 : x
2. Step 2: Convert to fraction form
   1,046.98/1,569.86 = 429.98/x
3. Step 3: Cross multiply
   1,046.98x = 1,569.86 × 429.98
4. Step 4: Simplify right side
   1,046.98x = 675,012.05
5. Step 5: Solve for x
   x = 675,012.05/1,046.98
6. Step 6: Final answer
   x = 644.73