Finding the Fourth Proportional to 42,728.56, 64,082.31 and 19,350.34

Step by Step Solution

1. Step 1: Write the proportion equation
   42,728.56 : 64,082.31 = 19,350.34 : x
2. Step 2: Convert to fraction form
   42,728.56/64,082.31 = 19,350.34/x
3. Step 3: Cross multiply
   42,728.56x = 64,082.31 × 19,350.34
4. Step 4: Simplify right side
   42,728.56x = 1,240,014,486.49
5. Step 5: Solve for x
   x = 1,240,014,486.49/42,728.56
6. Step 6: Final answer
   x = 29,020.74