Finding the Fourth Proportional to 1,469.94, 2,028.56 and 840.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,469.94 : 2,028.56 = 840.56 : x
2. Step 2: Convert to fraction form
   1,469.94/2,028.56 = 840.56/x
3. Step 3: Cross multiply
   1,469.94x = 2,028.56 × 840.56
4. Step 4: Simplify right side
   1,469.94x = 1,705,126.39
5. Step 5: Solve for x
   x = 1,705,126.39/1,469.94
6. Step 6: Final answer
   x = 1,160.00