Finding the Fourth Proportional to 42,748.20, 64,123.41 and 20,253.62

Step by Step Solution

1. Step 1: Write the proportion equation
   42,748.20 : 64,123.41 = 20,253.62 : x
2. Step 2: Convert to fraction form
   42,748.20/64,123.41 = 20,253.62/x
3. Step 3: Cross multiply
   42,748.20x = 64,123.41 × 20,253.62
4. Step 4: Simplify right side
   42,748.20x = 1,298,730,858.63
5. Step 5: Solve for x
   x = 1,298,730,858.63/42,748.20
6. Step 6: Final answer
   x = 30,380.95