Finding the Fourth Proportional to 2,212.50, 3,318.52 and 1,388.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212.50 : 3,318.52 = 1,388.33 : x
2. Step 2: Convert to fraction form
   2,212.50/3,318.52 = 1,388.33/x
3. Step 3: Cross multiply
   2,212.50x = 3,318.52 × 1,388.33
4. Step 4: Simplify right side
   2,212.50x = 4,607,200.87
5. Step 5: Solve for x
   x = 4,607,200.87/2,212.50
6. Step 6: Final answer
   x = 2,082.35