Finding the Fourth Proportional to 1,030.62, 1,421.91 and 616.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.62 : 1,421.91 = 616.38 : x
2. Step 2: Convert to fraction form
   1,030.62/1,421.91 = 616.38/x
3. Step 3: Cross multiply
   1,030.62x = 1,421.91 × 616.38
4. Step 4: Simplify right side
   1,030.62x = 876,436.89
5. Step 5: Solve for x
   x = 876,436.89/1,030.62
6. Step 6: Final answer
   x = 850.40