Finding the Fourth Proportional to 139,052.30, 208,510.40 and 50,292.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,052.30 : 208,510.40 = 50,292.50 : x
2. Step 2: Convert to fraction form
   139,052.30/208,510.40 = 50,292.50/x
3. Step 3: Cross multiply
   139,052.30x = 208,510.40 × 50,292.50
4. Step 4: Simplify right side
   139,052.30x = 10,486,508,375.18
5. Step 5: Solve for x
   x = 10,486,508,375.18/139,052.30
6. Step 6: Final answer
   x = 75,414.13