Finding the Fourth Proportional to 139,474.24, 209,199.51 and 55,211.49

Step by Step Solution

1. Step 1: Write the proportion equation
   139,474.24 : 209,199.51 = 55,211.49 : x
2. Step 2: Convert to fraction form
   139,474.24/209,199.51 = 55,211.49/x
3. Step 3: Cross multiply
   139,474.24x = 209,199.51 × 55,211.49
4. Step 4: Simplify right side
   139,474.24x = 11,550,216,654.37
5. Step 5: Solve for x
   x = 11,550,216,654.37/139,474.24
6. Step 6: Final answer
   x = 82,812.54