Finding the Fourth Proportional to 1,432.72, 2,139.28 and 1,283.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.72 : 2,139.28 = 1,283.51 : x
2. Step 2: Convert to fraction form
   1,432.72/2,139.28 = 1,283.51/x
3. Step 3: Cross multiply
   1,432.72x = 2,139.28 × 1,283.51
4. Step 4: Simplify right side
   1,432.72x = 2,745,791.82
5. Step 5: Solve for x
   x = 2,745,791.82/1,432.72
6. Step 6: Final answer
   x = 1,916.49