Finding the Fourth Proportional to 20,520.51, 30,743.69 and 9,436.47

Step by Step Solution

1. Step 1: Write the proportion equation
   20,520.51 : 30,743.69 = 9,436.47 : x
2. Step 2: Convert to fraction form
   20,520.51/30,743.69 = 9,436.47/x
3. Step 3: Cross multiply
   20,520.51x = 30,743.69 × 9,436.47
4. Step 4: Simplify right side
   20,520.51x = 290,111,861.19
5. Step 5: Solve for x
   x = 290,111,861.19/20,520.51
6. Step 6: Final answer
   x = 14,137.65