Finding the Fourth Proportional to 1,311.47, 1,809.88 and 722.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.47 : 1,809.88 = 722.00 : x
2. Step 2: Convert to fraction form
   1,311.47/1,809.88 = 722.00/x
3. Step 3: Cross multiply
   1,311.47x = 1,809.88 × 722.00
4. Step 4: Simplify right side
   1,311.47x = 1,306,724.31
5. Step 5: Solve for x
   x = 1,306,724.31/1,311.47
6. Step 6: Final answer
   x = 996.38