Finding the Fourth Proportional to 139,004.88, 208,475.28 and 82,860.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,004.88 : 208,475.28 = 82,860.80 : x
2. Step 2: Convert to fraction form
   139,004.88/208,475.28 = 82,860.80/x
3. Step 3: Cross multiply
   139,004.88x = 208,475.28 × 82,860.80
4. Step 4: Simplify right side
   139,004.88x = 17,274,428,481.02
5. Step 5: Solve for x
   x = 17,274,428,481.02/139,004.88
6. Step 6: Final answer
   x = 124,272.10