Finding the Fourth Proportional to 139,484.24, 209,214.50 and 55,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,484.24 : 209,214.50 = 55,221.50 : x
2. Step 2: Convert to fraction form
   139,484.24/209,214.50 = 55,221.50/x
3. Step 3: Cross multiply
   139,484.24x = 209,214.50 × 55,221.50
4. Step 4: Simplify right side
   139,484.24x = 11,553,138,511.75
5. Step 5: Solve for x
   x = 11,553,138,511.75/139,484.24
6. Step 6: Final answer
   x = 82,827.55