Finding the Fourth Proportional to 1,851.04, 2,553.72 and 1,187.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,851.04 : 2,553.72 = 1,187.78 : x
2. Step 2: Convert to fraction form
   1,851.04/2,553.72 = 1,187.78/x
3. Step 3: Cross multiply
   1,851.04x = 2,553.72 × 1,187.78
4. Step 4: Simplify right side
   1,851.04x = 3,033,257.54
5. Step 5: Solve for x
   x = 3,033,257.54/1,851.04
6. Step 6: Final answer
   x = 1,638.68