Finding the Fourth Proportional to 2,861.69, 4,292.60 and 913.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.69 : 4,292.60 = 913.89 : x
2. Step 2: Convert to fraction form
   2,861.69/4,292.60 = 913.89/x
3. Step 3: Cross multiply
   2,861.69x = 4,292.60 × 913.89
4. Step 4: Simplify right side
   2,861.69x = 3,922,971.38
5. Step 5: Solve for x
   x = 3,922,971.38/2,861.69
6. Step 6: Final answer
   x = 1,370.86