Finding the Fourth Proportional to 287,170.72, 430,470.69 and 137,235.94

Step by Step Solution

1. Step 1: Write the proportion equation
   287,170.72 : 430,470.69 = 137,235.94 : x
2. Step 2: Convert to fraction form
   287,170.72/430,470.69 = 137,235.94/x
3. Step 3: Cross multiply
   287,170.72x = 430,470.69 × 137,235.94
4. Step 4: Simplify right side
   287,170.72x = 59,076,049,784.60
5. Step 5: Solve for x
   x = 59,076,049,784.60/287,170.72
6. Step 6: Final answer
   x = 205,717.53