Finding the Fourth Proportional to 1,678.89, 2,314.32 and 1,236.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.89 : 2,314.32 = 1,236.03 : x
2. Step 2: Convert to fraction form
   1,678.89/2,314.32 = 1,236.03/x
3. Step 3: Cross multiply
   1,678.89x = 2,314.32 × 1,236.03
4. Step 4: Simplify right side
   1,678.89x = 2,860,568.95
5. Step 5: Solve for x
   x = 2,860,568.95/1,678.89
6. Step 6: Final answer
   x = 1,703.85