Finding the Fourth Proportional to 1,528.90, 2,109.29 and 1,081.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.90 : 2,109.29 = 1,081.43 : x
2. Step 2: Convert to fraction form
   1,528.90/2,109.29 = 1,081.43/x
3. Step 3: Cross multiply
   1,528.90x = 2,109.29 × 1,081.43
4. Step 4: Simplify right side
   1,528.90x = 2,281,033.53
5. Step 5: Solve for x
   x = 2,281,033.53/1,528.90
6. Step 6: Final answer
   x = 1,491.95