Finding the Fourth Proportional to 139,797.98, 209,489.60 and 102,680.54

Step by Step Solution

1. Step 1: Write the proportion equation
   139,797.98 : 209,489.60 = 102,680.54 : x
2. Step 2: Convert to fraction form
   139,797.98/209,489.60 = 102,680.54/x
3. Step 3: Cross multiply
   139,797.98x = 209,489.60 × 102,680.54
4. Step 4: Simplify right side
   139,797.98x = 21,510,503,691.53
5. Step 5: Solve for x
   x = 21,510,503,691.53/139,797.98
6. Step 6: Final answer
   x = 153,868.49