Finding the Fourth Proportional to 42,838.89, 64,260.72 and 13,254.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,838.89 : 64,260.72 = 13,254.42 : x
2. Step 2: Convert to fraction form
   42,838.89/64,260.72 = 13,254.42/x
3. Step 3: Cross multiply
   42,838.89x = 64,260.72 × 13,254.42
4. Step 4: Simplify right side
   42,838.89x = 851,738,362.94
5. Step 5: Solve for x
   x = 851,738,362.94/42,838.89
6. Step 6: Final answer
   x = 19,882.36