Finding the Fourth Proportional to 139,822.49, 192,872.49 and 98,940.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,822.49 : 192,872.49 = 98,940.57 : x
2. Step 2: Convert to fraction form
   139,822.49/192,872.49 = 98,940.57/x
3. Step 3: Cross multiply
   139,822.49x = 192,872.49 × 98,940.57
4. Step 4: Simplify right side
   139,822.49x = 19,082,914,097.92
5. Step 5: Solve for x
   x = 19,082,914,097.92/139,822.49
6. Step 6: Final answer
   x = 136,479.58