Finding the Fourth Proportional to 1,422.54, 1,962.42 and 980.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.54 : 1,962.42 = 980.70 : x
2. Step 2: Convert to fraction form
   1,422.54/1,962.42 = 980.70/x
3. Step 3: Cross multiply
   1,422.54x = 1,962.42 × 980.70
4. Step 4: Simplify right side
   1,422.54x = 1,924,545.29
5. Step 5: Solve for x
   x = 1,924,545.29/1,422.54
6. Step 6: Final answer
   x = 1,352.89