Finding the Fourth Proportional to 1,528.86, 2,109.87 and 899.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.86 : 2,109.87 = 899.43 : x
2. Step 2: Convert to fraction form
   1,528.86/2,109.87 = 899.43/x
3. Step 3: Cross multiply
   1,528.86x = 2,109.87 × 899.43
4. Step 4: Simplify right side
   1,528.86x = 1,897,680.37
5. Step 5: Solve for x
   x = 1,897,680.37/1,528.86
6. Step 6: Final answer
   x = 1,241.24