Finding the Fourth Proportional to 42,806.34, 64,151.18 and 20,618.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,806.34 : 64,151.18 = 20,618.10 : x
2. Step 2: Convert to fraction form
   42,806.34/64,151.18 = 20,618.10/x
3. Step 3: Cross multiply
   42,806.34x = 64,151.18 × 20,618.10
4. Step 4: Simplify right side
   42,806.34x = 1,322,675,444.36
5. Step 5: Solve for x
   x = 1,322,675,444.36/42,806.34
6. Step 6: Final answer
   x = 30,899.05