Finding the Fourth Proportional to 3,870.22, 5,805.60 and 1,272.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.22 : 5,805.60 = 1,272.28 : x
2. Step 2: Convert to fraction form
   3,870.22/5,805.60 = 1,272.28/x
3. Step 3: Cross multiply
   3,870.22x = 5,805.60 × 1,272.28
4. Step 4: Simplify right side
   3,870.22x = 7,386,348.77
5. Step 5: Solve for x
   x = 7,386,348.77/3,870.22
6. Step 6: Final answer
   x = 1,908.51