Finding the Fourth Proportional to 1,432.16, 1,976.24 and 810.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.16 : 1,976.24 = 810.72 : x
2. Step 2: Convert to fraction form
   1,432.16/1,976.24 = 810.72/x
3. Step 3: Cross multiply
   1,432.16x = 1,976.24 × 810.72
4. Step 4: Simplify right side
   1,432.16x = 1,602,177.29
5. Step 5: Solve for x
   x = 1,602,177.29/1,432.16
6. Step 6: Final answer
   x = 1,118.71