Finding the Fourth Proportional to 215,892.81, 297,931.50 and 120,399.62

Step by Step Solution

1. Step 1: Write the proportion equation
   215,892.81 : 297,931.50 = 120,399.62 : x
2. Step 2: Convert to fraction form
   215,892.81/297,931.50 = 120,399.62/x
3. Step 3: Cross multiply
   215,892.81x = 297,931.50 × 120,399.62
4. Step 4: Simplify right side
   215,892.81x = 35,870,837,896.37
5. Step 5: Solve for x
   x = 35,870,837,896.37/215,892.81
6. Step 6: Final answer
   x = 166,151.15