Finding the Fourth Proportional to 309,892.14, 427,665.15 and 242,707.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,892.14 : 427,665.15 = 242,707.50 : x
2. Step 2: Convert to fraction form
   309,892.14/427,665.15 = 242,707.50/x
3. Step 3: Cross multiply
   309,892.14x = 427,665.15 × 242,707.50
4. Step 4: Simplify right side
   309,892.14x = 103,797,539,393.63
5. Step 5: Solve for x
   x = 103,797,539,393.63/309,892.14
6. Step 6: Final answer
   x = 334,947.31