Finding the Fourth Proportional to 52,991.86, 79,413.98 and 39,828.89

Step by Step Solution

1. Step 1: Write the proportion equation
   52,991.86 : 79,413.98 = 39,828.89 : x
2. Step 2: Convert to fraction form
   52,991.86/79,413.98 = 39,828.89/x
3. Step 3: Cross multiply
   52,991.86x = 79,413.98 × 39,828.89
4. Step 4: Simplify right side
   52,991.86x = 3,162,970,673.88
5. Step 5: Solve for x
   x = 3,162,970,673.88/52,991.86
6. Step 6: Final answer
   x = 59,687.86