Finding the Fourth Proportional to 3,768.72, 5,200.80 and 2,112.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,768.72 : 5,200.80 = 2,112.72 : x
2. Step 2: Convert to fraction form
   3,768.72/5,200.80 = 2,112.72/x
3. Step 3: Cross multiply
   3,768.72x = 5,200.80 × 2,112.72
4. Step 4: Simplify right side
   3,768.72x = 10,987,834.18
5. Step 5: Solve for x
   x = 10,987,834.18/3,768.72
6. Step 6: Final answer
   x = 2,915.53