Finding the Fourth Proportional to 86,146.38, 129,141.72 and 30,729.42

Step by Step Solution

1. Step 1: Write the proportion equation
   86,146.38 : 129,141.72 = 30,729.42 : x
2. Step 2: Convert to fraction form
   86,146.38/129,141.72 = 30,729.42/x
3. Step 3: Cross multiply
   86,146.38x = 129,141.72 × 30,729.42
4. Step 4: Simplify right side
   86,146.38x = 3,968,450,153.40
5. Step 5: Solve for x
   x = 3,968,450,153.40/86,146.38
6. Step 6: Final answer
   x = 46,066.36