Finding the Fourth Proportional to 206,399.72, 284,890.56 and 121,565.72

Step by Step Solution

1. Step 1: Write the proportion equation
   206,399.72 : 284,890.56 = 121,565.72 : x
2. Step 2: Convert to fraction form
   206,399.72/284,890.56 = 121,565.72/x
3. Step 3: Cross multiply
   206,399.72x = 284,890.56 × 121,565.72
4. Step 4: Simplify right side
   206,399.72x = 34,632,926,047.60
5. Step 5: Solve for x
   x = 34,632,926,047.60/206,399.72
6. Step 6: Final answer
   x = 167,795.41