Finding the Fourth Proportional to 1,279.31, 1,918.56 and 723.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.31 : 1,918.56 = 723.34 : x
2. Step 2: Convert to fraction form
   1,279.31/1,918.56 = 723.34/x
3. Step 3: Cross multiply
   1,279.31x = 1,918.56 × 723.34
4. Step 4: Simplify right side
   1,279.31x = 1,387,761.60
5. Step 5: Solve for x
   x = 1,387,761.60/1,279.31
6. Step 6: Final answer
   x = 1,084.77