Finding the Fourth Proportional to 1,380.08, 1,904.56 and 938.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.08 : 1,904.56 = 938.18 : x
2. Step 2: Convert to fraction form
   1,380.08/1,904.56 = 938.18/x
3. Step 3: Cross multiply
   1,380.08x = 1,904.56 × 938.18
4. Step 4: Simplify right side
   1,380.08x = 1,786,820.10
5. Step 5: Solve for x
   x = 1,786,820.10/1,380.08
6. Step 6: Final answer
   x = 1,294.72