Finding the Fourth Proportional to 1,030.18, 1,421.69 and 610.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.18 : 1,421.69 = 610.76 : x
2. Step 2: Convert to fraction form
   1,030.18/1,421.69 = 610.76/x
3. Step 3: Cross multiply
   1,030.18x = 1,421.69 × 610.76
4. Step 4: Simplify right side
   1,030.18x = 868,311.38
5. Step 5: Solve for x
   x = 868,311.38/1,030.18
6. Step 6: Final answer
   x = 842.87