Finding the Fourth Proportional to 1,432.71, 1,984.80 and 1,398.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.71 : 1,984.80 = 1,398.69 : x
2. Step 2: Convert to fraction form
   1,432.71/1,984.80 = 1,398.69/x
3. Step 3: Cross multiply
   1,432.71x = 1,984.80 × 1,398.69
4. Step 4: Simplify right side
   1,432.71x = 2,776,119.91
5. Step 5: Solve for x
   x = 2,776,119.91/1,432.71
6. Step 6: Final answer
   x = 1,937.67