Finding the Fourth Proportional to 1,780.60, 2,457.30 and 994.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.60 : 2,457.30 = 994.72 : x
2. Step 2: Convert to fraction form
   1,780.60/2,457.30 = 994.72/x
3. Step 3: Cross multiply
   1,780.60x = 2,457.30 × 994.72
4. Step 4: Simplify right side
   1,780.60x = 2,444,325.46
5. Step 5: Solve for x
   x = 2,444,325.46/1,780.60
6. Step 6: Final answer
   x = 1,372.75