Finding the Fourth Proportional to 1,030.79, 1,422.49 and 558.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.79 : 1,422.49 = 558.69 : x
2. Step 2: Convert to fraction form
   1,030.79/1,422.49 = 558.69/x
3. Step 3: Cross multiply
   1,030.79x = 1,422.49 × 558.69
4. Step 4: Simplify right side
   1,030.79x = 794,723.83
5. Step 5: Solve for x
   x = 794,723.83/1,030.79
6. Step 6: Final answer
   x = 770.99