Finding the Fourth Proportional to 2,861.50, 4,291.34 and 913.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.50 : 4,291.34 = 913.25 : x
2. Step 2: Convert to fraction form
   2,861.50/4,291.34 = 913.25/x
3. Step 3: Cross multiply
   2,861.50x = 4,291.34 × 913.25
4. Step 4: Simplify right side
   2,861.50x = 3,919,066.26
5. Step 5: Solve for x
   x = 3,919,066.26/2,861.50
6. Step 6: Final answer
   x = 1,369.58