Finding the Fourth Proportional to 21,916,142.82, 30,237,421.77 and 13,216,976.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,916,142.82 : 30,237,421.77 = 13,216,976.10 : x
2. Step 2: Convert to fraction form
   21,916,142.82/30,237,421.77 = 13,216,976.10/x
3. Step 3: Cross multiply
   21,916,142.82x = 30,237,421.77 × 13,216,976.10
4. Step 4: Simplify right side
   21,916,142.82x = 399,647,280,859,709.69
5. Step 5: Solve for x
   x = 399,647,280,859,709.69/21,916,142.82
6. Step 6: Final answer
   x = 18,235,292.78