Finding the Fourth Proportional to 139,960.86, 209,869.98 and 51,191.34

Step by Step Solution

1. Step 1: Write the proportion equation
   139,960.86 : 209,869.98 = 51,191.34 : x
2. Step 2: Convert to fraction form
   139,960.86/209,869.98 = 51,191.34/x
3. Step 3: Cross multiply
   139,960.86x = 209,869.98 × 51,191.34
4. Step 4: Simplify right side
   139,960.86x = 10,743,525,501.97
5. Step 5: Solve for x
   x = 10,743,525,501.97/139,960.86
6. Step 6: Final answer
   x = 76,760.93