Finding the Fourth Proportional to 139,530.30, 209,168.86 and 50,721.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,530.30 : 209,168.86 = 50,721.08 : x
2. Step 2: Convert to fraction form
   139,530.30/209,168.86 = 50,721.08/x
3. Step 3: Cross multiply
   139,530.30x = 209,168.86 × 50,721.08
4. Step 4: Simplify right side
   139,530.30x = 10,609,270,481.57
5. Step 5: Solve for x
   x = 10,609,270,481.57/139,530.30
6. Step 6: Final answer
   x = 76,035.60