Finding the Fourth Proportional to 1,238.86, 1,857.40 and 622.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.86 : 1,857.40 = 622.12 : x
2. Step 2: Convert to fraction form
   1,238.86/1,857.40 = 622.12/x
3. Step 3: Cross multiply
   1,238.86x = 1,857.40 × 622.12
4. Step 4: Simplify right side
   1,238.86x = 1,155,525.69
5. Step 5: Solve for x
   x = 1,155,525.69/1,238.86
6. Step 6: Final answer
   x = 932.73