Finding the Fourth Proportional to 2,216.25, 3,058.43 and 1,388.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.25 : 3,058.43 = 1,388.25 : x
2. Step 2: Convert to fraction form
   2,216.25/3,058.43 = 1,388.25/x
3. Step 3: Cross multiply
   2,216.25x = 3,058.43 × 1,388.25
4. Step 4: Simplify right side
   2,216.25x = 4,245,858.51
5. Step 5: Solve for x
   x = 4,245,858.51/2,216.25
6. Step 6: Final answer
   x = 1,915.79