Finding the Fourth Proportional to 1,780.81, 2,457.61 and 994.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.81 : 2,457.61 = 994.81 : x
2. Step 2: Convert to fraction form
   1,780.81/2,457.61 = 994.81/x
3. Step 3: Cross multiply
   1,780.81x = 2,457.61 × 994.81
4. Step 4: Simplify right side
   1,780.81x = 2,444,846.37
5. Step 5: Solve for x
   x = 2,444,846.37/1,780.81
6. Step 6: Final answer
   x = 1,372.89