Finding the Fourth Proportional to 1,054.16, 1,454.72 and 588.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.16 : 1,454.72 = 588.40 : x
2. Step 2: Convert to fraction form
   1,054.16/1,454.72 = 588.40/x
3. Step 3: Cross multiply
   1,054.16x = 1,454.72 × 588.40
4. Step 4: Simplify right side
   1,054.16x = 855,957.25
5. Step 5: Solve for x
   x = 855,957.25/1,054.16
6. Step 6: Final answer
   x = 811.98