Finding the Fourth Proportional to 86,379.38, 129,491.31 and 30,936.50

Step by Step Solution

1. Step 1: Write the proportion equation
   86,379.38 : 129,491.31 = 30,936.50 : x
2. Step 2: Convert to fraction form
   86,379.38/129,491.31 = 30,936.50/x
3. Step 3: Cross multiply
   86,379.38x = 129,491.31 × 30,936.50
4. Step 4: Simplify right side
   86,379.38x = 4,006,007,911.82
5. Step 5: Solve for x
   x = 4,006,007,911.82/86,379.38
6. Step 6: Final answer
   x = 46,376.90