Finding the Fourth Proportional to 1,442.31, 2,164.23 and 711.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.31 : 2,164.23 = 711.90 : x
2. Step 2: Convert to fraction form
   1,442.31/2,164.23 = 711.90/x
3. Step 3: Cross multiply
   1,442.31x = 2,164.23 × 711.90
4. Step 4: Simplify right side
   1,442.31x = 1,540,715.34
5. Step 5: Solve for x
   x = 1,540,715.34/1,442.31
6. Step 6: Final answer
   x = 1,068.23