Finding the Fourth Proportional to 309,971.59, 427,754.52 and 172,143.21

Step by Step Solution

1. Step 1: Write the proportion equation
   309,971.59 : 427,754.52 = 172,143.21 : x
2. Step 2: Convert to fraction form
   309,971.59/427,754.52 = 172,143.21/x
3. Step 3: Cross multiply
   309,971.59x = 427,754.52 × 172,143.21
4. Step 4: Simplify right side
   309,971.59x = 73,635,033,165.32
5. Step 5: Solve for x
   x = 73,635,033,165.32/309,971.59
6. Step 6: Final answer
   x = 237,554.14