Finding the Fourth Proportional to 1,784.72, 2,462.92 and 998.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,784.72 : 2,462.92 = 998.80 : x
2. Step 2: Convert to fraction form
   1,784.72/2,462.92 = 998.80/x
3. Step 3: Cross multiply
   1,784.72x = 2,462.92 × 998.80
4. Step 4: Simplify right side
   1,784.72x = 2,459,964.50
5. Step 5: Solve for x
   x = 2,459,964.50/1,784.72
6. Step 6: Final answer
   x = 1,378.35