Finding the Fourth Proportional to 1,528.92, 2,109.33 and 899.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.92 : 2,109.33 = 899.37 : x
2. Step 2: Convert to fraction form
   1,528.92/2,109.33 = 899.37/x
3. Step 3: Cross multiply
   1,528.92x = 2,109.33 × 899.37
4. Step 4: Simplify right side
   1,528.92x = 1,897,068.12
5. Step 5: Solve for x
   x = 1,897,068.12/1,528.92
6. Step 6: Final answer
   x = 1,240.79