Finding the Fourth Proportional to 1,628.91, 2,247.89 and 920.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,628.91 : 2,247.89 = 920.84 : x
2. Step 2: Convert to fraction form
   1,628.91/2,247.89 = 920.84/x
3. Step 3: Cross multiply
   1,628.91x = 2,247.89 × 920.84
4. Step 4: Simplify right side
   1,628.91x = 2,069,931.18
5. Step 5: Solve for x
   x = 2,069,931.18/1,628.91
6. Step 6: Final answer
   x = 1,270.75