Finding the Fourth Proportional to 20,548,142.69, 28,345,686.17 and 12,705,147.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,548,142.69 : 28,345,686.17 = 12,705,147.82 : x
2. Step 2: Convert to fraction form
   20,548,142.69/28,345,686.17 = 12,705,147.82/x
3. Step 3: Cross multiply
   20,548,142.69x = 28,345,686.17 × 12,705,147.82
4. Step 4: Simplify right side
   20,548,142.69x = 360,136,132,707,451.25
5. Step 5: Solve for x
   x = 360,136,132,707,451.25/20,548,142.69
6. Step 6: Final answer
   x = 17,526,456.68