Finding the Fourth Proportional to 139,715.93, 209,456.34 and 60,770.70

Step by Step Solution

1. Step 1: Write the proportion equation
   139,715.93 : 209,456.34 = 60,770.70 : x
2. Step 2: Convert to fraction form
   139,715.93/209,456.34 = 60,770.70/x
3. Step 3: Cross multiply
   139,715.93x = 209,456.34 × 60,770.70
4. Step 4: Simplify right side
   139,715.93x = 12,728,808,401.24
5. Step 5: Solve for x
   x = 12,728,808,401.24/139,715.93
6. Step 6: Final answer
   x = 91,104.92