Finding the Fourth Proportional to 2,590.35, 3,885.59 and 642.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,590.35 : 3,885.59 = 642.52 : x
2. Step 2: Convert to fraction form
   2,590.35/3,885.59 = 642.52/x
3. Step 3: Cross multiply
   2,590.35x = 3,885.59 × 642.52
4. Step 4: Simplify right side
   2,590.35x = 2,496,569.29
5. Step 5: Solve for x
   x = 2,496,569.29/2,590.35
6. Step 6: Final answer
   x = 963.80