Finding the Fourth Proportional to 139,253.31, 208,896.30 and 80,089.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,253.31 : 208,896.30 = 80,089.56 : x
2. Step 2: Convert to fraction form
   139,253.31/208,896.30 = 80,089.56/x
3. Step 3: Cross multiply
   139,253.31x = 208,896.30 × 80,089.56
4. Step 4: Simplify right side
   139,253.31x = 16,730,412,752.63
5. Step 5: Solve for x
   x = 16,730,412,752.63/139,253.31
6. Step 6: Final answer
   x = 120,143.73