Finding the Fourth Proportional to 42,849.48, 64,280.34 and 13,269.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,849.48 : 64,280.34 = 13,269.60 : x
2. Step 2: Convert to fraction form
   42,849.48/64,280.34 = 13,269.60/x
3. Step 3: Cross multiply
   42,849.48x = 64,280.34 × 13,269.60
4. Step 4: Simplify right side
   42,849.48x = 852,974,399.66
5. Step 5: Solve for x
   x = 852,974,399.66/42,849.48
6. Step 6: Final answer
   x = 19,906.30