Finding the Fourth Proportional to 42,955.70, 64,390.46 and 20,426.67

Step by Step Solution

1. Step 1: Write the proportion equation
   42,955.70 : 64,390.46 = 20,426.67 : x
2. Step 2: Convert to fraction form
   42,955.70/64,390.46 = 20,426.67/x
3. Step 3: Cross multiply
   42,955.70x = 64,390.46 × 20,426.67
4. Step 4: Simplify right side
   42,955.70x = 1,315,282,575.43
5. Step 5: Solve for x
   x = 1,315,282,575.43/42,955.70
6. Step 6: Final answer
   x = 30,619.52