Finding the Fourth Proportional to 139,474.84, 209,213.72 and 55,255.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,474.84 : 209,213.72 = 55,255.50 : x
2. Step 2: Convert to fraction form
   139,474.84/209,213.72 = 55,255.50/x
3. Step 3: Cross multiply
   139,474.84x = 209,213.72 × 55,255.50
4. Step 4: Simplify right side
   139,474.84x = 11,560,208,705.46
5. Step 5: Solve for x
   x = 11,560,208,705.46/139,474.84
6. Step 6: Final answer
   x = 82,883.83