Finding the Fourth Proportional to 139,802.34, 192,940.65 and 86,118.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,802.34 : 192,940.65 = 86,118.78 : x
2. Step 2: Convert to fraction form
   139,802.34/192,940.65 = 86,118.78/x
3. Step 3: Cross multiply
   139,802.34x = 192,940.65 × 86,118.78
4. Step 4: Simplify right side
   139,802.34x = 16,615,813,390.41
5. Step 5: Solve for x
   x = 16,615,813,390.41/139,802.34
6. Step 6: Final answer
   x = 118,852.18