Finding the Fourth Proportional to 1,008.42, 1,391.63 and 610.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.42 : 1,391.63 = 610.10 : x
2. Step 2: Convert to fraction form
   1,008.42/1,391.63 = 610.10/x
3. Step 3: Cross multiply
   1,008.42x = 1,391.63 × 610.10
4. Step 4: Simplify right side
   1,008.42x = 849,023.45
5. Step 5: Solve for x
   x = 849,023.45/1,008.42
6. Step 6: Final answer
   x = 841.93