Finding the Fourth Proportional to 139,476.84, 209,216.72 and 55,257.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,476.84 : 209,216.72 = 55,257.50 : x
2. Step 2: Convert to fraction form
   139,476.84/209,216.72 = 55,257.50/x
3. Step 3: Cross multiply
   139,476.84x = 209,216.72 × 55,257.50
4. Step 4: Simplify right side
   139,476.84x = 11,560,792,905.40
5. Step 5: Solve for x
   x = 11,560,792,905.40/139,476.84
6. Step 6: Final answer
   x = 82,886.83