Finding the Fourth Proportional to 1,030.85, 1,422.57 and 558.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.85 : 1,422.57 = 558.76 : x
2. Step 2: Convert to fraction form
   1,030.85/1,422.57 = 558.76/x
3. Step 3: Cross multiply
   1,030.85x = 1,422.57 × 558.76
4. Step 4: Simplify right side
   1,030.85x = 794,866.89
5. Step 5: Solve for x
   x = 794,866.89/1,030.85
6. Step 6: Final answer
   x = 771.08