Finding the Fourth Proportional to 1,528.38, 2,109.04 and 890.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.38 : 2,109.04 = 890.22 : x
2. Step 2: Convert to fraction form
   1,528.38/2,109.04 = 890.22/x
3. Step 3: Cross multiply
   1,528.38x = 2,109.04 × 890.22
4. Step 4: Simplify right side
   1,528.38x = 1,877,515.27
5. Step 5: Solve for x
   x = 1,877,515.27/1,528.38
6. Step 6: Final answer
   x = 1,228.43