Finding the Fourth Proportional to 139,188.85, 208,782.69 and 50,421.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,188.85 : 208,782.69 = 50,421.58 : x
2. Step 2: Convert to fraction form
   139,188.85/208,782.69 = 50,421.58/x
3. Step 3: Cross multiply
   139,188.85x = 208,782.69 × 50,421.58
4. Step 4: Simplify right side
   139,188.85x = 10,527,153,106.45
5. Step 5: Solve for x
   x = 10,527,153,106.45/139,188.85
6. Step 6: Final answer
   x = 75,632.16