Finding the Fourth Proportional to 1,238.00, 1,855.85 and 621.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.00 : 1,855.85 = 621.17 : x
2. Step 2: Convert to fraction form
   1,238.00/1,855.85 = 621.17/x
3. Step 3: Cross multiply
   1,238.00x = 1,855.85 × 621.17
4. Step 4: Simplify right side
   1,238.00x = 1,152,785.96
5. Step 5: Solve for x
   x = 1,152,785.96/1,238.00
6. Step 6: Final answer
   x = 931.17