Finding the Fourth Proportional to 139,533.52, 209,431.80 and 50,872.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,533.52 : 209,431.80 = 50,872.72 : x
2. Step 2: Convert to fraction form
   139,533.52/209,431.80 = 50,872.72/x
3. Step 3: Cross multiply
   139,533.52x = 209,431.80 × 50,872.72
4. Step 4: Simplify right side
   139,533.52x = 10,654,365,320.50
5. Step 5: Solve for x
   x = 10,654,365,320.50/139,533.52
6. Step 6: Final answer
   x = 76,357.03