Finding the Fourth Proportional to 395,443.50, 593,042.58 and 142,691.10

Step by Step Solution

1. Step 1: Write the proportion equation
   395,443.50 : 593,042.58 = 142,691.10 : x
2. Step 2: Convert to fraction form
   395,443.50/593,042.58 = 142,691.10/x
3. Step 3: Cross multiply
   395,443.50x = 593,042.58 × 142,691.10
4. Step 4: Simplify right side
   395,443.50x = 84,621,898,087.04
5. Step 5: Solve for x
   x = 84,621,898,087.04/395,443.50
6. Step 6: Final answer
   x = 213,992.39