Finding the Fourth Proportional to 139,064.40, 208,612.80 and 50,359.68

Step by Step Solution

1. Step 1: Write the proportion equation
   139,064.40 : 208,612.80 = 50,359.68 : x
2. Step 2: Convert to fraction form
   139,064.40/208,612.80 = 50,359.68/x
3. Step 3: Cross multiply
   139,064.40x = 208,612.80 × 50,359.68
4. Step 4: Simplify right side
   139,064.40x = 10,505,673,851.90
5. Step 5: Solve for x
   x = 10,505,673,851.90/139,064.40
6. Step 6: Final answer
   x = 75,545.39