Finding the Fourth Proportional to 139,917.38, 193,031.06 and 86,108.97

Step by Step Solution

1. Step 1: Write the proportion equation
   139,917.38 : 193,031.06 = 86,108.97 : x
2. Step 2: Convert to fraction form
   139,917.38/193,031.06 = 86,108.97/x
3. Step 3: Cross multiply
   139,917.38x = 193,031.06 × 86,108.97
4. Step 4: Simplify right side
   139,917.38x = 16,621,705,754.61
5. Step 5: Solve for x
   x = 16,621,705,754.61/139,917.38
6. Step 6: Final answer
   x = 118,796.58