Finding the Fourth Proportional to 1,528.42, 2,108.10 and 938.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.42 : 2,108.10 = 938.50 : x
2. Step 2: Convert to fraction form
   1,528.42/2,108.10 = 938.50/x
3. Step 3: Cross multiply
   1,528.42x = 2,108.10 × 938.50
4. Step 4: Simplify right side
   1,528.42x = 1,978,451.85
5. Step 5: Solve for x
   x = 1,978,451.85/1,528.42
6. Step 6: Final answer
   x = 1,294.44