Finding the Fourth Proportional to 1,432.68, 1,976.56 and 842.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.68 : 1,976.56 = 842.80 : x
2. Step 2: Convert to fraction form
   1,432.68/1,976.56 = 842.80/x
3. Step 3: Cross multiply
   1,432.68x = 1,976.56 × 842.80
4. Step 4: Simplify right side
   1,432.68x = 1,665,844.77
5. Step 5: Solve for x
   x = 1,665,844.77/1,432.68
6. Step 6: Final answer
   x = 1,162.75