Finding the Fourth Proportional to 309,864.71, 427,611.60 and 173,898.51

Step by Step Solution

1. Step 1: Write the proportion equation
   309,864.71 : 427,611.60 = 173,898.51 : x
2. Step 2: Convert to fraction form
   309,864.71/427,611.60 = 173,898.51/x
3. Step 3: Cross multiply
   309,864.71x = 427,611.60 × 173,898.51
4. Step 4: Simplify right side
   309,864.71x = 74,361,020,098.72
5. Step 5: Solve for x
   x = 74,361,020,098.72/309,864.71
6. Step 6: Final answer
   x = 239,978.99