Finding the Fourth Proportional to 1,528.69, 2,109.61 and 899.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.69 : 2,109.61 = 899.42 : x
2. Step 2: Convert to fraction form
   1,528.69/2,109.61 = 899.42/x
3. Step 3: Cross multiply
   1,528.69x = 2,109.61 × 899.42
4. Step 4: Simplify right side
   1,528.69x = 1,897,425.43
5. Step 5: Solve for x
   x = 1,897,425.43/1,528.69
6. Step 6: Final answer
   x = 1,241.21