Finding the Fourth Proportional to 2,215.62, 3,307.59 and 2,138.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.62 : 3,307.59 = 2,138.67 : x
2. Step 2: Convert to fraction form
   2,215.62/3,307.59 = 2,138.67/x
3. Step 3: Cross multiply
   2,215.62x = 3,307.59 × 2,138.67
4. Step 4: Simplify right side
   2,215.62x = 7,073,843.51
5. Step 5: Solve for x
   x = 7,073,843.51/2,215.62
6. Step 6: Final answer
   x = 3,192.72