Finding the Fourth Proportional to 139,796.72, 209,544.24 and 68,636.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,796.72 : 209,544.24 = 68,636.60 : x
2. Step 2: Convert to fraction form
   139,796.72/209,544.24 = 68,636.60/x
3. Step 3: Cross multiply
   139,796.72x = 209,544.24 × 68,636.60
4. Step 4: Simplify right side
   139,796.72x = 14,382,404,707.04
5. Step 5: Solve for x
   x = 14,382,404,707.04/139,796.72
6. Step 6: Final answer
   x = 102,880.84