Finding the Fourth Proportional to 1,521.63, 2,282.46 and 426.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.63 : 2,282.46 = 426.00 : x
2. Step 2: Convert to fraction form
   1,521.63/2,282.46 = 426.00/x
3. Step 3: Cross multiply
   1,521.63x = 2,282.46 × 426.00
4. Step 4: Simplify right side
   1,521.63x = 972,314.42
5. Step 5: Solve for x
   x = 972,314.42/1,521.63
6. Step 6: Final answer
   x = 639.00