Finding the Fourth Proportional to 1,780.56, 2,457.17 and 983.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.56 : 2,457.17 = 983.89 : x
2. Step 2: Convert to fraction form
   1,780.56/2,457.17 = 983.89/x
3. Step 3: Cross multiply
   1,780.56x = 2,457.17 × 983.89
4. Step 4: Simplify right side
   1,780.56x = 2,417,572.09
5. Step 5: Solve for x
   x = 2,417,572.09/1,780.56
6. Step 6: Final answer
   x = 1,357.76