Finding the Fourth Proportional to 378,860.72, 522,826.72 and 209,093.63

Step by Step Solution

1. Step 1: Write the proportion equation
   378,860.72 : 522,826.72 = 209,093.63 : x
2. Step 2: Convert to fraction form
   378,860.72/522,826.72 = 209,093.63/x
3. Step 3: Cross multiply
   378,860.72x = 522,826.72 × 209,093.63
4. Step 4: Simplify right side
   378,860.72x = 109,319,733,608.93
5. Step 5: Solve for x
   x = 109,319,733,608.93/378,860.72
6. Step 6: Final answer
   x = 288,548.61