Finding the Fourth Proportional to 381,648.42, 526,689.42 and 209,580.72

Step by Step Solution

1. Step 1: Write the proportion equation
   381,648.42 : 526,689.42 = 209,580.72 : x
2. Step 2: Convert to fraction form
   381,648.42/526,689.42 = 209,580.72/x
3. Step 3: Cross multiply
   381,648.42x = 526,689.42 × 209,580.72
4. Step 4: Simplify right side
   381,648.42x = 110,383,947,859.98
5. Step 5: Solve for x
   x = 110,383,947,859.98/381,648.42
6. Step 6: Final answer
   x = 289,229.41