Finding the Fourth Proportional to 139,801.34, 192,939.27 and 86,117.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,801.34 : 192,939.27 = 86,117.78 : x
2. Step 2: Convert to fraction form
   139,801.34/192,939.27 = 86,117.78/x
3. Step 3: Cross multiply
   139,801.34x = 192,939.27 × 86,117.78
4. Step 4: Simplify right side
   139,801.34x = 16,615,501,766.63
5. Step 5: Solve for x
   x = 16,615,501,766.63/139,801.34
6. Step 6: Final answer
   x = 118,850.80