Finding the Fourth Proportional to 235,892.34, 353,933.28 and 86,142.78

Step by Step Solution

1. Step 1: Write the proportion equation
   235,892.34 : 353,933.28 = 86,142.78 : x
2. Step 2: Convert to fraction form
   235,892.34/353,933.28 = 86,142.78/x
3. Step 3: Cross multiply
   235,892.34x = 353,933.28 × 86,142.78
4. Step 4: Simplify right side
   235,892.34x = 30,488,796,673.72
5. Step 5: Solve for x
   x = 30,488,796,673.72/235,892.34
6. Step 6: Final answer
   x = 129,248.78