Finding the Fourth Proportional to 139,941.72, 209,945.39 and 55,707.03

Step by Step Solution

1. Step 1: Write the proportion equation
   139,941.72 : 209,945.39 = 55,707.03 : x
2. Step 2: Convert to fraction form
   139,941.72/209,945.39 = 55,707.03/x
3. Step 3: Cross multiply
   139,941.72x = 209,945.39 × 55,707.03
4. Step 4: Simplify right side
   139,941.72x = 11,695,433,860.56
5. Step 5: Solve for x
   x = 11,695,433,860.56/139,941.72
6. Step 6: Final answer
   x = 83,573.60