Finding the Fourth Proportional to 42,782.06, 64,119.60 and 20,589.48

Step by Step Solution

1. Step 1: Write the proportion equation
   42,782.06 : 64,119.60 = 20,589.48 : x
2. Step 2: Convert to fraction form
   42,782.06/64,119.60 = 20,589.48/x
3. Step 3: Cross multiply
   42,782.06x = 64,119.60 × 20,589.48
4. Step 4: Simplify right side
   42,782.06x = 1,320,189,221.81
5. Step 5: Solve for x
   x = 1,320,189,221.81/42,782.06
6. Step 6: Final answer
   x = 30,858.48