Finding the Fourth Proportional to 20,981,034.15, 31,436,759.49 and 12,758,804.78

Step by Step Solution

1. Step 1: Write the proportion equation
   20,981,034.15 : 31,436,759.49 = 12,758,804.78 : x
2. Step 2: Convert to fraction form
   20,981,034.15/31,436,759.49 = 12,758,804.78/x
3. Step 3: Cross multiply
   20,981,034.15x = 31,436,759.49 × 12,758,804.78
4. Step 4: Simplify right side
   20,981,034.15x = 401,095,477,059,641.56
5. Step 5: Solve for x
   x = 401,095,477,059,641.56/20,981,034.15
6. Step 6: Final answer
   x = 19,117,049.91