Finding the Fourth Proportional to 3,931.71, 5,426.28 and 3,599.54

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.71 : 5,426.28 = 3,599.54 : x
2. Step 2: Convert to fraction form
   3,931.71/5,426.28 = 3,599.54/x
3. Step 3: Cross multiply
   3,931.71x = 5,426.28 × 3,599.54
4. Step 4: Simplify right side
   3,931.71x = 19,532,084.78
5. Step 5: Solve for x
   x = 19,532,084.78/3,931.71
6. Step 6: Final answer
   x = 4,967.84