Finding the Fourth Proportional to 42,805.34, 64,149.68 and 20,617.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,805.34 : 64,149.68 = 20,617.10 : x
2. Step 2: Convert to fraction form
   42,805.34/64,149.68 = 20,617.10/x
3. Step 3: Cross multiply
   42,805.34x = 64,149.68 × 20,617.10
4. Step 4: Simplify right side
   42,805.34x = 1,322,580,367.53
5. Step 5: Solve for x
   x = 1,322,580,367.53/42,805.34
6. Step 6: Final answer
   x = 30,897.56