Finding the Fourth Proportional to 20,776,238.10, 28,689,592.68 and 12,949,108.56

Step by Step Solution

1. Step 1: Write the proportion equation
   20,776,238.10 : 28,689,592.68 = 12,949,108.56 : x
2. Step 2: Convert to fraction form
   20,776,238.10/28,689,592.68 = 12,949,108.56/x
3. Step 3: Cross multiply
   20,776,238.10x = 28,689,592.68 × 12,949,108.56
4. Step 4: Simplify right side
   20,776,238.10x = 371,504,650,155,501.38
5. Step 5: Solve for x
   x = 371,504,650,155,501.38/20,776,238.10
6. Step 6: Final answer
   x = 17,881,227.99