Finding the Fourth Proportional to 42,804.34, 64,148.18 and 20,616.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,804.34 : 64,148.18 = 20,616.10 : x
2. Step 2: Convert to fraction form
   42,804.34/64,148.18 = 20,616.10/x
3. Step 3: Cross multiply
   42,804.34x = 64,148.18 × 20,616.10
4. Step 4: Simplify right side
   42,804.34x = 1,322,485,293.70
5. Step 5: Solve for x
   x = 1,322,485,293.70/42,804.34
6. Step 6: Final answer
   x = 30,896.06