Finding the Fourth Proportional to 2,513.78, 3,472.40 and 1,931.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,513.78 : 3,472.40 = 1,931.59 : x
2. Step 2: Convert to fraction form
   2,513.78/3,472.40 = 1,931.59/x
3. Step 3: Cross multiply
   2,513.78x = 3,472.40 × 1,931.59
4. Step 4: Simplify right side
   2,513.78x = 6,707,234.78
5. Step 5: Solve for x
   x = 6,707,234.78/2,513.78
6. Step 6: Final answer
   x = 2,668.19