Finding the Fourth Proportional to 3,788.20, 5,227.78 and 2,109.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,788.20 : 5,227.78 = 2,109.72 : x
2. Step 2: Convert to fraction form
   3,788.20/5,227.78 = 2,109.72/x
3. Step 3: Cross multiply
   3,788.20x = 5,227.78 × 2,109.72
4. Step 4: Simplify right side
   3,788.20x = 11,029,152.02
5. Step 5: Solve for x
   x = 11,029,152.02/3,788.20
6. Step 6: Final answer
   x = 2,911.45