Finding the Fourth Proportional to 219,399.40, 307,859 and 219,399.40

Step by Step Solution

1. Step 1: Write the proportion equation
   219,399.40 : 307,859 = 219,399.40 : x
2. Step 2: Convert to fraction form
   219,399.40/307,859 = 219,399.40/x
3. Step 3: Cross multiply
   219,399.40x = 307,859 × 219,399.40
4. Step 4: Simplify right side
   219,399.40x = 67,544,079,884.60
5. Step 5: Solve for x
   x = 67,544,079,884.60/219,399.40
6. Step 6: Final answer
   x = 307,859