Finding the Fourth Proportional to 1,442.32, 1,989.30 and 970.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.32 : 1,989.30 = 970.72 : x
2. Step 2: Convert to fraction form
   1,442.32/1,989.30 = 970.72/x
3. Step 3: Cross multiply
   1,442.32x = 1,989.30 × 970.72
4. Step 4: Simplify right side
   1,442.32x = 1,931,053.30
5. Step 5: Solve for x
   x = 1,931,053.30/1,442.32
6. Step 6: Final answer
   x = 1,338.85