Finding the Fourth Proportional to 2,272.69, 3,136.52 and 1,278.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,272.69 : 3,136.52 = 1,278.21 : x
2. Step 2: Convert to fraction form
   2,272.69/3,136.52 = 1,278.21/x
3. Step 3: Cross multiply
   2,272.69x = 3,136.52 × 1,278.21
4. Step 4: Simplify right side
   2,272.69x = 4,009,131.23
5. Step 5: Solve for x
   x = 4,009,131.23/2,272.69
6. Step 6: Final answer
   x = 1,764.05