Finding the Fourth Proportional to 2,330.40, 3,215.52 and 1,386.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,330.40 : 3,215.52 = 1,386.42 : x
2. Step 2: Convert to fraction form
   2,330.40/3,215.52 = 1,386.42/x
3. Step 3: Cross multiply
   2,330.40x = 3,215.52 × 1,386.42
4. Step 4: Simplify right side
   2,330.40x = 4,458,061.24
5. Step 5: Solve for x
   x = 4,458,061.24/2,330.40
6. Step 6: Final answer
   x = 1,913.00