Finding the Fourth Proportional to 42,772.50, 64,185.48 and 20,588.22

Step by Step Solution

1. Step 1: Write the proportion equation
   42,772.50 : 64,185.48 = 20,588.22 : x
2. Step 2: Convert to fraction form
   42,772.50/64,185.48 = 20,588.22/x
3. Step 3: Cross multiply
   42,772.50x = 64,185.48 × 20,588.22
4. Step 4: Simplify right side
   42,772.50x = 1,321,464,783.05
5. Step 5: Solve for x
   x = 1,321,464,783.05/42,772.50
6. Step 6: Final answer
   x = 30,895.20