Finding the Fourth Proportional to 139,797.86, 209,489.42 and 102,680.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,797.86 : 209,489.42 = 102,680.42 : x
2. Step 2: Convert to fraction form
   139,797.86/209,489.42 = 102,680.42/x
3. Step 3: Cross multiply
   139,797.86x = 209,489.42 × 102,680.42
4. Step 4: Simplify right side
   139,797.86x = 21,510,461,631.16
5. Step 5: Solve for x
   x = 21,510,461,631.16/139,797.86
6. Step 6: Final answer
   x = 153,868.32