Finding the Fourth Proportional to 1,054.52, 1,580.25 and 725.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.52 : 1,580.25 = 725.12 : x
2. Step 2: Convert to fraction form
   1,054.52/1,580.25 = 725.12/x
3. Step 3: Cross multiply
   1,054.52x = 1,580.25 × 725.12
4. Step 4: Simplify right side
   1,054.52x = 1,145,870.88
5. Step 5: Solve for x
   x = 1,145,870.88/1,054.52
6. Step 6: Final answer
   x = 1,086.63