Finding the Fourth Proportional to 1,432.40, 1,976.90 and 842.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.40 : 1,976.90 = 842.99 : x
2. Step 2: Convert to fraction form
   1,432.40/1,976.90 = 842.99/x
3. Step 3: Cross multiply
   1,432.40x = 1,976.90 × 842.99
4. Step 4: Simplify right side
   1,432.40x = 1,666,502.72
5. Step 5: Solve for x
   x = 1,666,502.72/1,432.40
6. Step 6: Final answer
   x = 1,163.43