Finding the Fourth Proportional to 1,142.72, 1,714.40 and 970.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.72 : 1,714.40 = 970.60 : x
2. Step 2: Convert to fraction form
   1,142.72/1,714.40 = 970.60/x
3. Step 3: Cross multiply
   1,142.72x = 1,714.40 × 970.60
4. Step 4: Simplify right side
   1,142.72x = 1,663,996.64
5. Step 5: Solve for x
   x = 1,663,996.64/1,142.72
6. Step 6: Final answer
   x = 1,456.17