Finding the Fourth Proportional to 1,227.89, 1,839.20 and 1,117.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.89 : 1,839.20 = 1,117.60 : x
2. Step 2: Convert to fraction form
   1,227.89/1,839.20 = 1,117.60/x
3. Step 3: Cross multiply
   1,227.89x = 1,839.20 × 1,117.60
4. Step 4: Simplify right side
   1,227.89x = 2,055,479.73
5. Step 5: Solve for x
   x = 2,055,479.73/1,227.89
6. Step 6: Final answer
   x = 1,673.99