Finding the Fourth Proportional to 3,870.73, 5,805.80 and 1,238.13

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.73 : 5,805.80 = 1,238.13 : x
2. Step 2: Convert to fraction form
   3,870.73/5,805.80 = 1,238.13/x
3. Step 3: Cross multiply
   3,870.73x = 5,805.80 × 1,238.13
4. Step 4: Simplify right side
   3,870.73x = 7,188,335.15
5. Step 5: Solve for x
   x = 7,188,335.15/3,870.73
6. Step 6: Final answer
   x = 1,857.10