Finding the Fourth Proportional to 1,432.31, 1,976.72 and 872.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.31 : 1,976.72 = 872.65 : x
2. Step 2: Convert to fraction form
   1,432.31/1,976.72 = 872.65/x
3. Step 3: Cross multiply
   1,432.31x = 1,976.72 × 872.65
4. Step 4: Simplify right side
   1,432.31x = 1,724,984.71
5. Step 5: Solve for x
   x = 1,724,984.71/1,432.31
6. Step 6: Final answer
   x = 1,204.34