Finding the Fourth Proportional to 140,890.50, 194,448.78 and 87,192.81

Step by Step Solution

1. Step 1: Write the proportion equation
   140,890.50 : 194,448.78 = 87,192.81 : x
2. Step 2: Convert to fraction form
   140,890.50/194,448.78 = 87,192.81/x
3. Step 3: Cross multiply
   140,890.50x = 194,448.78 × 87,192.81
4. Step 4: Simplify right side
   140,890.50x = 16,954,535,529.27
5. Step 5: Solve for x
   x = 16,954,535,529.27/140,890.50
6. Step 6: Final answer
   x = 120,338.39