Finding the Fourth Proportional to 309,752.72, 427,699.56 and 238,019.60

Step by Step Solution

1. Step 1: Write the proportion equation
   309,752.72 : 427,699.56 = 238,019.60 : x
2. Step 2: Convert to fraction form
   309,752.72/427,699.56 = 238,019.60/x
3. Step 3: Cross multiply
   309,752.72x = 427,699.56 × 238,019.60
4. Step 4: Simplify right side
   309,752.72x = 101,800,878,191.38
5. Step 5: Solve for x
   x = 101,800,878,191.38/309,752.72
6. Step 6: Final answer
   x = 328,652.09