Finding the Fourth Proportional to 387,443.08, 534,669.42 and 217,675.72

Step by Step Solution

1. Step 1: Write the proportion equation
   387,443.08 : 534,669.42 = 217,675.72 : x
2. Step 2: Convert to fraction form
   387,443.08/534,669.42 = 217,675.72/x
3. Step 3: Cross multiply
   387,443.08x = 534,669.42 × 217,675.72
4. Step 4: Simplify right side
   387,443.08x = 116,384,550,960.48
5. Step 5: Solve for x
   x = 116,384,550,960.48/387,443.08
6. Step 6: Final answer
   x = 300,391.35