Finding the Fourth Proportional to 1,226.72, 1,839.58 and 610.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,226.72 : 1,839.58 = 610.20 : x
2. Step 2: Convert to fraction form
   1,226.72/1,839.58 = 610.20/x
3. Step 3: Cross multiply
   1,226.72x = 1,839.58 × 610.20
4. Step 4: Simplify right side
   1,226.72x = 1,122,511.72
5. Step 5: Solve for x
   x = 1,122,511.72/1,226.72
6. Step 6: Final answer
   x = 915.05