Finding the Fourth Proportional to 1,528.91, 2,109.78 and 899.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.91 : 2,109.78 = 899.46 : x
2. Step 2: Convert to fraction form
   1,528.91/2,109.78 = 899.46/x
3. Step 3: Cross multiply
   1,528.91x = 2,109.78 × 899.46
4. Step 4: Simplify right side
   1,528.91x = 1,897,667.26
5. Step 5: Solve for x
   x = 1,897,667.26/1,528.91
6. Step 6: Final answer
   x = 1,241.19