Finding the Fourth Proportional to 1,432.20, 1,976.48 and 1,013.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.20 : 1,976.48 = 1,013.30 : x
2. Step 2: Convert to fraction form
   1,432.20/1,976.48 = 1,013.30/x
3. Step 3: Cross multiply
   1,432.20x = 1,976.48 × 1,013.30
4. Step 4: Simplify right side
   1,432.20x = 2,002,767.18
5. Step 5: Solve for x
   x = 2,002,767.18/1,432.20
6. Step 6: Final answer
   x = 1,398.39