Finding the Fourth Proportional to 139,900.62, 209,875.85 and 65,105.22

Step by Step Solution

1. Step 1: Write the proportion equation
   139,900.62 : 209,875.85 = 65,105.22 : x
2. Step 2: Convert to fraction form
   139,900.62/209,875.85 = 65,105.22/x
3. Step 3: Cross multiply
   139,900.62x = 209,875.85 × 65,105.22
4. Step 4: Simplify right side
   139,900.62x = 13,664,013,061.41
5. Step 5: Solve for x
   x = 13,664,013,061.41/139,900.62
6. Step 6: Final answer
   x = 97,669.42