Finding the Fourth Proportional to 1,619.52, 2,235.20 and 998.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,619.52 : 2,235.20 = 998.56 : x
2. Step 2: Convert to fraction form
   1,619.52/2,235.20 = 998.56/x
3. Step 3: Cross multiply
   1,619.52x = 2,235.20 × 998.56
4. Step 4: Simplify right side
   1,619.52x = 2,231,981.31
5. Step 5: Solve for x
   x = 2,231,981.31/1,619.52
6. Step 6: Final answer
   x = 1,378.17