Finding the Fourth Proportional to 1,432.30, 1,975.80 and 842.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.30 : 1,975.80 = 842.74 : x
2. Step 2: Convert to fraction form
   1,432.30/1,975.80 = 842.74/x
3. Step 3: Cross multiply
   1,432.30x = 1,975.80 × 842.74
4. Step 4: Simplify right side
   1,432.30x = 1,665,085.69
5. Step 5: Solve for x
   x = 1,665,085.69/1,432.30
6. Step 6: Final answer
   x = 1,162.53