Finding the Fourth Proportional to 1,789.78, 2,470 and 1,003.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,789.78 : 2,470 = 1,003.94 : x
2. Step 2: Convert to fraction form
   1,789.78/2,470 = 1,003.94/x
3. Step 3: Cross multiply
   1,789.78x = 2,470 × 1,003.94
4. Step 4: Simplify right side
   1,789.78x = 2,479,731.80
5. Step 5: Solve for x
   x = 2,479,731.80/1,789.78
6. Step 6: Final answer
   x = 1,385.50