Finding the Fourth Proportional to 42,769.50, 64,180.98 and 20,585.22

Step by Step Solution

1. Step 1: Write the proportion equation
   42,769.50 : 64,180.98 = 20,585.22 : x
2. Step 2: Convert to fraction form
   42,769.50/64,180.98 = 20,585.22/x
3. Step 3: Cross multiply
   42,769.50x = 64,180.98 × 20,585.22
4. Step 4: Simplify right side
   42,769.50x = 1,321,179,593.12
5. Step 5: Solve for x
   x = 1,321,179,593.12/42,769.50
6. Step 6: Final answer
   x = 30,890.70