Finding the Fourth Proportional to 139,719.20, 209,413.74 and 59,733.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,719.20 : 209,413.74 = 59,733.76 : x
2. Step 2: Convert to fraction form
   139,719.20/209,413.74 = 59,733.76/x
3. Step 3: Cross multiply
   139,719.20x = 209,413.74 × 59,733.76
4. Step 4: Simplify right side
   139,719.20x = 12,509,070,085.86
5. Step 5: Solve for x
   x = 12,509,070,085.86/139,719.20
6. Step 6: Final answer
   x = 89,530.07