Finding the Fourth Proportional to 1,351.72, 1,864.80 and 998.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.72 : 1,864.80 = 998.49 : x
2. Step 2: Convert to fraction form
   1,351.72/1,864.80 = 998.49/x
3. Step 3: Cross multiply
   1,351.72x = 1,864.80 × 998.49
4. Step 4: Simplify right side
   1,351.72x = 1,861,984.15
5. Step 5: Solve for x
   x = 1,861,984.15/1,351.72
6. Step 6: Final answer
   x = 1,377.49