Finding the Fourth Proportional to 1,528.93, 2,109.57 and 931.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.93 : 2,109.57 = 931.27 : x
2. Step 2: Convert to fraction form
   1,528.93/2,109.57 = 931.27/x
3. Step 3: Cross multiply
   1,528.93x = 2,109.57 × 931.27
4. Step 4: Simplify right side
   1,528.93x = 1,964,579.25
5. Step 5: Solve for x
   x = 1,964,579.25/1,528.93
6. Step 6: Final answer
   x = 1,284.94