Finding the Fourth Proportional to 42,785.42, 64,150.79 and 20,554.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,785.42 : 64,150.79 = 20,554.56 : x
2. Step 2: Convert to fraction form
   42,785.42/64,150.79 = 20,554.56/x
3. Step 3: Cross multiply
   42,785.42x = 64,150.79 × 20,554.56
4. Step 4: Simplify right side
   42,785.42x = 1,318,591,159.33
5. Step 5: Solve for x
   x = 1,318,591,159.33/42,785.42
6. Step 6: Final answer
   x = 30,818.71