Finding the Fourth Proportional to 21,420,366.72, 29,552,806.24 and 13,689,868.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,420,366.72 : 29,552,806.24 = 13,689,868.48 : x
2. Step 2: Convert to fraction form
   21,420,366.72/29,552,806.24 = 13,689,868.48/x
3. Step 3: Cross multiply
   21,420,366.72x = 29,552,806.24 × 13,689,868.48
4. Step 4: Simplify right side
   21,420,366.72x = 404,574,030,640,523.31
5. Step 5: Solve for x
   x = 404,574,030,640,523.31/21,420,366.72
6. Step 6: Final answer
   x = 18,887,353.14