Finding the Fourth Proportional to 1,780.61, 2,457.29 and 994.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.61 : 2,457.29 = 994.59 : x
2. Step 2: Convert to fraction form
   1,780.61/2,457.29 = 994.59/x
3. Step 3: Cross multiply
   1,780.61x = 2,457.29 × 994.59
4. Step 4: Simplify right side
   1,780.61x = 2,443,991.09
5. Step 5: Solve for x
   x = 2,443,991.09/1,780.61
6. Step 6: Final answer
   x = 1,372.56