Finding the Fourth Proportional to 1,528.25, 2,108.30 and 938.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.25 : 2,108.30 = 938.43 : x
2. Step 2: Convert to fraction form
   1,528.25/2,108.30 = 938.43/x
3. Step 3: Cross multiply
   1,528.25x = 2,108.30 × 938.43
4. Step 4: Simplify right side
   1,528.25x = 1,978,487.28
5. Step 5: Solve for x
   x = 1,978,487.28/1,528.25
6. Step 6: Final answer
   x = 1,294.61