Finding the Fourth Proportional to 139,187.34, 208,780.44 and 50,420.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139,187.34 : 208,780.44 = 50,420.06 : x
2. Step 2: Convert to fraction form
   139,187.34/208,780.44 = 50,420.06/x
3. Step 3: Cross multiply
   139,187.34x = 208,780.44 × 50,420.06
4. Step 4: Simplify right side
   139,187.34x = 10,526,722,311.63
5. Step 5: Solve for x
   x = 10,526,722,311.63/139,187.34
6. Step 6: Final answer
   x = 75,629.88