Finding the Fourth Proportional to 1,348.80, 1,859.52 and 998.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.80 : 1,859.52 = 998.40 : x
2. Step 2: Convert to fraction form
   1,348.80/1,859.52 = 998.40/x
3. Step 3: Cross multiply
   1,348.80x = 1,859.52 × 998.40
4. Step 4: Simplify right side
   1,348.80x = 1,856,544.77
5. Step 5: Solve for x
   x = 1,856,544.77/1,348.80
6. Step 6: Final answer
   x = 1,376.44