Finding the Fourth Proportional to 139,942.72, 209,946.89 and 55,708.03

Step by Step Solution

1. Step 1: Write the proportion equation
   139,942.72 : 209,946.89 = 55,708.03 : x
2. Step 2: Convert to fraction form
   139,942.72/209,946.89 = 55,708.03/x
3. Step 3: Cross multiply
   139,942.72x = 209,946.89 × 55,708.03
4. Step 4: Simplify right side
   139,942.72x = 11,695,727,646.53
5. Step 5: Solve for x
   x = 11,695,727,646.53/139,942.72
6. Step 6: Final answer
   x = 83,575.11