Finding the Fourth Proportional to 2,878.81, 3,972.72 and 1,636.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,878.81 : 3,972.72 = 1,636.81 : x
2. Step 2: Convert to fraction form
   2,878.81/3,972.72 = 1,636.81/x
3. Step 3: Cross multiply
   2,878.81x = 3,972.72 × 1,636.81
4. Step 4: Simplify right side
   2,878.81x = 6,502,587.82
5. Step 5: Solve for x
   x = 6,502,587.82/2,878.81
6. Step 6: Final answer
   x = 2,258.78