Finding the Fourth Proportional to 2,861.15, 4,291.71 and 1,012.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.15 : 4,291.71 = 1,012.40 : x
2. Step 2: Convert to fraction form
   2,861.15/4,291.71 = 1,012.40/x
3. Step 3: Cross multiply
   2,861.15x = 4,291.71 × 1,012.40
4. Step 4: Simplify right side
   2,861.15x = 4,344,920.89
5. Step 5: Solve for x
   x = 4,344,920.89/2,861.15
6. Step 6: Final answer
   x = 1,518.59