Finding the Fourth Proportional to 3,931.59, 5,901.82 and 2,690.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.59 : 5,901.82 = 2,690.12 : x
2. Step 2: Convert to fraction form
   3,931.59/5,901.82 = 2,690.12/x
3. Step 3: Cross multiply
   3,931.59x = 5,901.82 × 2,690.12
4. Step 4: Simplify right side
   3,931.59x = 15,876,639.26
5. Step 5: Solve for x
   x = 15,876,639.26/3,931.59
6. Step 6: Final answer
   x = 4,038.23