Finding the Fourth Proportional to 139,857.49, 193,017.27 and 85,406.65

Step by Step Solution

1. Step 1: Write the proportion equation
   139,857.49 : 193,017.27 = 85,406.65 : x
2. Step 2: Convert to fraction form
   139,857.49/193,017.27 = 85,406.65/x
3. Step 3: Cross multiply
   139,857.49x = 193,017.27 × 85,406.65
4. Step 4: Simplify right side
   139,857.49x = 16,484,957,995.81
5. Step 5: Solve for x
   x = 16,484,957,995.81/139,857.49
6. Step 6: Final answer
   x = 117,869.69