Finding the Fourth Proportional to 1,389.52, 2,085.48 and 722.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.52 : 2,085.48 = 722.88 : x
2. Step 2: Convert to fraction form
   1,389.52/2,085.48 = 722.88/x
3. Step 3: Cross multiply
   1,389.52x = 2,085.48 × 722.88
4. Step 4: Simplify right side
   1,389.52x = 1,507,551.78
5. Step 5: Solve for x
   x = 1,507,551.78/1,389.52
6. Step 6: Final answer
   x = 1,084.94