Finding the Fourth Proportional to 1,054.56, 1,455.24 and 588.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.56 : 1,455.24 = 588.72 : x
2. Step 2: Convert to fraction form
   1,054.56/1,455.24 = 588.72/x
3. Step 3: Cross multiply
   1,054.56x = 1,455.24 × 588.72
4. Step 4: Simplify right side
   1,054.56x = 856,728.89
5. Step 5: Solve for x
   x = 856,728.89/1,054.56
6. Step 6: Final answer
   x = 812.40