Finding the Fourth Proportional to 2,320.29, 3,200.99 and 1,388.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,320.29 : 3,200.99 = 1,388.25 : x
2. Step 2: Convert to fraction form
   2,320.29/3,200.99 = 1,388.25/x
3. Step 3: Cross multiply
   2,320.29x = 3,200.99 × 1,388.25
4. Step 4: Simplify right side
   2,320.29x = 4,443,767.43
5. Step 5: Solve for x
   x = 4,443,767.43/2,320.29
6. Step 6: Final answer
   x = 1,915.18