Finding the Fourth Proportional to 1,628.78, 2,441.27 and 807.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,628.78 : 2,441.27 = 807.57 : x
2. Step 2: Convert to fraction form
   1,628.78/2,441.27 = 807.57/x
3. Step 3: Cross multiply
   1,628.78x = 2,441.27 × 807.57
4. Step 4: Simplify right side
   1,628.78x = 1,971,498.43
5. Step 5: Solve for x
   x = 1,971,498.43/1,628.78
6. Step 6: Final answer
   x = 1,210.42