Finding the Fourth Proportional to 10,931.67, 16,401.03 and 3,911.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,931.67 : 16,401.03 = 3,911.55 : x
2. Step 2: Convert to fraction form
   10,931.67/16,401.03 = 3,911.55/x
3. Step 3: Cross multiply
   10,931.67x = 16,401.03 × 3,911.55
4. Step 4: Simplify right side
   10,931.67x = 64,153,448.90
5. Step 5: Solve for x
   x = 64,153,448.90/10,931.67
6. Step 6: Final answer
   x = 5,868.59