Finding the Fourth Proportional to 139,139.70, 208,659.95 and 50,370.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,139.70 : 208,659.95 = 50,370.18 : x
2. Step 2: Convert to fraction form
   139,139.70/208,659.95 = 50,370.18/x
3. Step 3: Cross multiply
   139,139.70x = 208,659.95 × 50,370.18
4. Step 4: Simplify right side
   139,139.70x = 10,510,239,240.29
5. Step 5: Solve for x
   x = 10,510,239,240.29/139,139.70
6. Step 6: Final answer
   x = 75,537.31