Finding the Fourth Proportional to 1,678.45, 2,318.20 and 1,118.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,678.45 : 2,318.20 = 1,118.00 : x
2. Step 2: Convert to fraction form
   1,678.45/2,318.20 = 1,118.00/x
3. Step 3: Cross multiply
   1,678.45x = 2,318.20 × 1,118.00
4. Step 4: Simplify right side
   1,678.45x = 2,591,736.01
5. Step 5: Solve for x
   x = 2,591,736.01/1,678.45
6. Step 6: Final answer
   x = 1,544.12