Finding the Fourth Proportional to 139,287.72, 208,962.57 and 50,539.26

Step by Step Solution

1. Step 1: Write the proportion equation
   139,287.72 : 208,962.57 = 50,539.26 : x
2. Step 2: Convert to fraction form
   139,287.72/208,962.57 = 50,539.26/x
3. Step 3: Cross multiply
   139,287.72x = 208,962.57 × 50,539.26
4. Step 4: Simplify right side
   139,287.72x = 10,560,814,344.35
5. Step 5: Solve for x
   x = 10,560,814,344.35/139,287.72
6. Step 6: Final answer
   x = 75,820.14