Finding the Fourth Proportional to 139,867.96, 209,822.61 and 51,100.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,867.96 : 209,822.61 = 51,100.72 : x
2. Step 2: Convert to fraction form
   139,867.96/209,822.61 = 51,100.72/x
3. Step 3: Cross multiply
   139,867.96x = 209,822.61 × 51,100.72
4. Step 4: Simplify right side
   139,867.96x = 10,722,086,443.28
5. Step 5: Solve for x
   x = 10,722,086,443.28/139,867.96
6. Step 6: Final answer
   x = 76,658.63