Finding the Fourth Proportional to 139,088.78, 208,541 and 50,330.74

Step by Step Solution

1. Step 1: Write the proportion equation
   139,088.78 : 208,541 = 50,330.74 : x
2. Step 2: Convert to fraction form
   139,088.78/208,541 = 50,330.74/x
3. Step 3: Cross multiply
   139,088.78x = 208,541 × 50,330.74
4. Step 4: Simplify right side
   139,088.78x = 10,496,022,850.34
5. Step 5: Solve for x
   x = 10,496,022,850.34/139,088.78
6. Step 6: Final answer
   x = 75,462.76