Finding the Fourth Proportional to 1,046.00, 1,567.62 and 428.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,046.00 : 1,567.62 = 428.98 : x
2. Step 2: Convert to fraction form
   1,046.00/1,567.62 = 428.98/x
3. Step 3: Cross multiply
   1,046.00x = 1,567.62 × 428.98
4. Step 4: Simplify right side
   1,046.00x = 672,474.78
5. Step 5: Solve for x
   x = 672,474.78/1,046.00
6. Step 6: Final answer
   x = 642.90