Finding the Fourth Proportional to 1,780.55, 2,457.18 and 994.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.55 : 2,457.18 = 994.61 : x
2. Step 2: Convert to fraction form
   1,780.55/2,457.18 = 994.61/x
3. Step 3: Cross multiply
   1,780.55x = 2,457.18 × 994.61
4. Step 4: Simplify right side
   1,780.55x = 2,443,923.51
5. Step 5: Solve for x
   x = 2,443,923.51/1,780.55
6. Step 6: Final answer
   x = 1,372.57