Finding the Fourth Proportional to 1,216.55, 1,825.17 and 558.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.55 : 1,825.17 = 558.86 : x
2. Step 2: Convert to fraction form
   1,216.55/1,825.17 = 558.86/x
3. Step 3: Cross multiply
   1,216.55x = 1,825.17 × 558.86
4. Step 4: Simplify right side
   1,216.55x = 1,020,011.71
5. Step 5: Solve for x
   x = 1,020,011.71/1,216.55
6. Step 6: Final answer
   x = 838.45