Finding the Fourth Proportional to 139,008.84, 208,481.28 and 82,864.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,008.84 : 208,481.28 = 82,864.80 : x
2. Step 2: Convert to fraction form
   139,008.84/208,481.28 = 82,864.80/x
3. Step 3: Cross multiply
   139,008.84x = 208,481.28 × 82,864.80
4. Step 4: Simplify right side
   139,008.84x = 17,275,759,570.94
5. Step 5: Solve for x
   x = 17,275,759,570.94/139,008.84
6. Step 6: Final answer
   x = 124,278.14