Finding the Fourth Proportional to 206,019.50, 309,053.75 and 72,872.51

Step by Step Solution

1. Step 1: Write the proportion equation
   206,019.50 : 309,053.75 = 72,872.51 : x
2. Step 2: Convert to fraction form
   206,019.50/309,053.75 = 72,872.51/x
3. Step 3: Cross multiply
   206,019.50x = 309,053.75 × 72,872.51
4. Step 4: Simplify right side
   206,019.50x = 22,521,520,577.78
5. Step 5: Solve for x
   x = 22,521,520,577.78/206,019.50
6. Step 6: Final answer
   x = 109,317.42