Finding the Fourth Proportional to 1,054.43, 1,580.15 and 498.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,054.43 : 1,580.15 = 498.54 : x
2. Step 2: Convert to fraction form
   1,054.43/1,580.15 = 498.54/x
3. Step 3: Cross multiply
   1,054.43x = 1,580.15 × 498.54
4. Step 4: Simplify right side
   1,054.43x = 787,767.98
5. Step 5: Solve for x
   x = 787,767.98/1,054.43
6. Step 6: Final answer
   x = 747.11