Finding the Fourth Proportional to 139,056.99, 208,461.77 and 50,290.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,056.99 : 208,461.77 = 50,290.76 : x
2. Step 2: Convert to fraction form
   139,056.99/208,461.77 = 50,290.76/x
3. Step 3: Cross multiply
   139,056.99x = 208,461.77 × 50,290.76
4. Step 4: Simplify right side
   139,056.99x = 10,483,699,927.66
5. Step 5: Solve for x
   x = 10,483,699,927.66/139,056.99
6. Step 6: Final answer
   x = 75,391.39