Finding the Fourth Proportional to 139,481.24, 209,210 and 55,218.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,481.24 : 209,210 = 55,218.50 : x
2. Step 2: Convert to fraction form
   139,481.24/209,210 = 55,218.50/x
3. Step 3: Cross multiply
   139,481.24x = 209,210 × 55,218.50
4. Step 4: Simplify right side
   139,481.24x = 11,552,262,385
5. Step 5: Solve for x
   x = 11,552,262,385/139,481.24
6. Step 6: Final answer
   x = 82,823.05