Finding the Fourth Proportional to 139,419.76, 209,129.64 and 50,656.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,419.76 : 209,129.64 = 50,656.72 : x
2. Step 2: Convert to fraction form
   139,419.76/209,129.64 = 50,656.72/x
3. Step 3: Cross multiply
   139,419.76x = 209,129.64 × 50,656.72
4. Step 4: Simplify right side
   139,419.76x = 10,593,821,617.18
5. Step 5: Solve for x
   x = 10,593,821,617.18/139,419.76
6. Step 6: Final answer
   x = 75,985.08