Finding the Fourth Proportional to 139,868.96, 209,824.12 and 51,101.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,868.96 : 209,824.12 = 51,101.72 : x
2. Step 2: Convert to fraction form
   139,868.96/209,824.12 = 51,101.72/x
3. Step 3: Cross multiply
   139,868.96x = 209,824.12 × 51,101.72
4. Step 4: Simplify right side
   139,868.96x = 10,722,373,429.49
5. Step 5: Solve for x
   x = 10,722,373,429.49/139,868.96
6. Step 6: Final answer
   x = 76,660.14