Finding the Fourth Proportional to 1,851.10, 2,554.86 and 1,188.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,851.10 : 2,554.86 = 1,188.78 : x
2. Step 2: Convert to fraction form
   1,851.10/2,554.86 = 1,188.78/x
3. Step 3: Cross multiply
   1,851.10x = 2,554.86 × 1,188.78
4. Step 4: Simplify right side
   1,851.10x = 3,037,166.47
5. Step 5: Solve for x
   x = 3,037,166.47/1,851.10
6. Step 6: Final answer
   x = 1,640.74