Finding the Fourth Proportional to 1,432.72, 1,979.58 and 1,140.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.72 : 1,979.58 = 1,140.58 : x
2. Step 2: Convert to fraction form
   1,432.72/1,979.58 = 1,140.58/x
3. Step 3: Cross multiply
   1,432.72x = 1,979.58 × 1,140.58
4. Step 4: Simplify right side
   1,432.72x = 2,257,869.36
5. Step 5: Solve for x
   x = 2,257,869.36/1,432.72
6. Step 6: Final answer
   x = 1,575.93