Finding the Fourth Proportional to 1,528.42, 2,110.31 and 939.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.42 : 2,110.31 = 939.15 : x
2. Step 2: Convert to fraction form
   1,528.42/2,110.31 = 939.15/x
3. Step 3: Cross multiply
   1,528.42x = 2,110.31 × 939.15
4. Step 4: Simplify right side
   1,528.42x = 1,981,897.64
5. Step 5: Solve for x
   x = 1,981,897.64/1,528.42
6. Step 6: Final answer
   x = 1,296.70