Finding the Fourth Proportional to 139,393.71, 209,016.45 and 55,150.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139,393.71 : 209,016.45 = 55,150.47 : x
2. Step 2: Convert to fraction form
   139,393.71/209,016.45 = 55,150.47/x
3. Step 3: Cross multiply
   139,393.71x = 209,016.45 × 55,150.47
4. Step 4: Simplify right side
   139,393.71x = 11,527,355,455.23
5. Step 5: Solve for x
   x = 11,527,355,455.23/139,393.71
6. Step 6: Final answer
   x = 82,696.38