Finding the Fourth Proportional to 3,931.31, 5,430.71 and 3,576.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.31 : 5,430.71 = 3,576.60 : x
2. Step 2: Convert to fraction form
   3,931.31/5,430.71 = 3,576.60/x
3. Step 3: Cross multiply
   3,931.31x = 5,430.71 × 3,576.60
4. Step 4: Simplify right side
   3,931.31x = 19,423,459.50
5. Step 5: Solve for x
   x = 19,423,459.50/3,931.31
6. Step 6: Final answer
   x = 4,940.72