Finding the Fourth Proportional to 2,590.34, 3,884.67 and 858.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,590.34 : 3,884.67 = 858.50 : x
2. Step 2: Convert to fraction form
   2,590.34/3,884.67 = 858.50/x
3. Step 3: Cross multiply
   2,590.34x = 3,884.67 × 858.50
4. Step 4: Simplify right side
   2,590.34x = 3,334,989.20
5. Step 5: Solve for x
   x = 3,334,989.20/2,590.34
6. Step 6: Final answer
   x = 1,287.47