Finding the Fourth Proportional to 235,456.66, 353,215.37 and 85,673.89

Step by Step Solution

1. Step 1: Write the proportion equation
   235,456.66 : 353,215.37 = 85,673.89 : x
2. Step 2: Convert to fraction form
   235,456.66/353,215.37 = 85,673.89/x
3. Step 3: Cross multiply
   235,456.66x = 353,215.37 × 85,673.89
4. Step 4: Simplify right side
   235,456.66x = 30,261,334,755.69
5. Step 5: Solve for x
   x = 30,261,334,755.69/235,456.66
6. Step 6: Final answer
   x = 128,521.89