Finding the Fourth Proportional to 139,248.72, 208,808.28 and 50,498.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,248.72 : 208,808.28 = 50,498.64 : x
2. Step 2: Convert to fraction form
   139,248.72/208,808.28 = 50,498.64/x
3. Step 3: Cross multiply
   139,248.72x = 208,808.28 × 50,498.64
4. Step 4: Simplify right side
   139,248.72x = 10,544,534,160.74
5. Step 5: Solve for x
   x = 10,544,534,160.74/139,248.72
6. Step 6: Final answer
   x = 75,724.46