Finding the Fourth Proportional to 139,909.20, 209,688.09 and 59,853.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,909.20 : 209,688.09 = 59,853.12 : x
2. Step 2: Convert to fraction form
   139,909.20/209,688.09 = 59,853.12/x
3. Step 3: Cross multiply
   139,909.20x = 209,688.09 × 59,853.12
4. Step 4: Simplify right side
   139,909.20x = 12,550,486,413.34
5. Step 5: Solve for x
   x = 12,550,486,413.34/139,909.20
6. Step 6: Final answer
   x = 89,704.51