Finding the Fourth Proportional to 3,915.27, 5,872.86 and 1,320.03

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.27 : 5,872.86 = 1,320.03 : x
2. Step 2: Convert to fraction form
   3,915.27/5,872.86 = 1,320.03/x
3. Step 3: Cross multiply
   3,915.27x = 5,872.86 × 1,320.03
4. Step 4: Simplify right side
   3,915.27x = 7,752,351.39
5. Step 5: Solve for x
   x = 7,752,351.39/3,915.27
6. Step 6: Final answer
   x = 1,980.03