Finding the Fourth Proportional to 53,707.59, 80,561.42 and 20,419.97

Step by Step Solution

1. Step 1: Write the proportion equation
   53,707.59 : 80,561.42 = 20,419.97 : x
2. Step 2: Convert to fraction form
   53,707.59/80,561.42 = 20,419.97/x
3. Step 3: Cross multiply
   53,707.59x = 80,561.42 × 20,419.97
4. Step 4: Simplify right side
   53,707.59x = 1,645,061,274.65
5. Step 5: Solve for x
   x = 1,645,061,274.65/53,707.59
6. Step 6: Final answer
   x = 30,629.96