Finding the Fourth Proportional to 1,780.99, 2,457.71 and 984.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.99 : 2,457.71 = 984.31 : x
2. Step 2: Convert to fraction form
   1,780.99/2,457.71 = 984.31/x
3. Step 3: Cross multiply
   1,780.99x = 2,457.71 × 984.31
4. Step 4: Simplify right side
   1,780.99x = 2,419,136.24
5. Step 5: Solve for x
   x = 2,419,136.24/1,780.99
6. Step 6: Final answer
   x = 1,358.31