Finding the Fourth Proportional to 628,612.72, 867,485.57 and 342,134.89

Step by Step Solution

1. Step 1: Write the proportion equation
   628,612.72 : 867,485.57 = 342,134.89 : x
2. Step 2: Convert to fraction form
   628,612.72/867,485.57 = 342,134.89/x
3. Step 3: Cross multiply
   628,612.72x = 867,485.57 × 342,134.89
4. Step 4: Simplify right side
   628,612.72x = 296,797,076,189.15
5. Step 5: Solve for x
   x = 296,797,076,189.15/628,612.72
6. Step 6: Final answer
   x = 472,146.15