Finding the Fourth Proportional to 2,786.42, 4,179.78 and 938.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,786.42 : 4,179.78 = 938.10 : x
2. Step 2: Convert to fraction form
   2,786.42/4,179.78 = 938.10/x
3. Step 3: Cross multiply
   2,786.42x = 4,179.78 × 938.10
4. Step 4: Simplify right side
   2,786.42x = 3,921,051.62
5. Step 5: Solve for x
   x = 3,921,051.62/2,786.42
6. Step 6: Final answer
   x = 1,407.20