Finding the Fourth Proportional to 1,002.88, 1,504.59 and 417.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.88 : 1,504.59 = 417.93 : x
2. Step 2: Convert to fraction form
   1,002.88/1,504.59 = 417.93/x
3. Step 3: Cross multiply
   1,002.88x = 1,504.59 × 417.93
4. Step 4: Simplify right side
   1,002.88x = 628,813.30
5. Step 5: Solve for x
   x = 628,813.30/1,002.88
6. Step 6: Final answer
   x = 627.01