Finding the Fourth Proportional to 42,999.08, 64,496.25 and 13,413.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42,999.08 : 64,496.25 = 13,413.49 : x
2. Step 2: Convert to fraction form
   42,999.08/64,496.25 = 13,413.49/x
3. Step 3: Cross multiply
   42,999.08x = 64,496.25 × 13,413.49
4. Step 4: Simplify right side
   42,999.08x = 865,119,643.17
5. Step 5: Solve for x
   x = 865,119,643.17/42,999.08
6. Step 6: Final answer
   x = 20,119.49