Finding the Fourth Proportional to 1,238.09, 1,856.06 and 620.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.09 : 1,856.06 = 620.93 : x
2. Step 2: Convert to fraction form
   1,238.09/1,856.06 = 620.93/x
3. Step 3: Cross multiply
   1,238.09x = 1,856.06 × 620.93
4. Step 4: Simplify right side
   1,238.09x = 1,152,480.23
5. Step 5: Solve for x
   x = 1,152,480.23/1,238.09
6. Step 6: Final answer
   x = 930.85