Finding the Fourth Proportional to 42,999.14, 64,496.42 and 13,413.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,999.14 : 64,496.42 = 13,413.58 : x
2. Step 2: Convert to fraction form
   42,999.14/64,496.42 = 13,413.58/x
3. Step 3: Cross multiply
   42,999.14x = 64,496.42 × 13,413.58
4. Step 4: Simplify right side
   42,999.14x = 865,127,889.38
5. Step 5: Solve for x
   x = 865,127,889.38/42,999.14
6. Step 6: Final answer
   x = 20,119.66