Finding the Fourth Proportional to 139,871.82, 209,658.33 and 55,515.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,871.82 : 209,658.33 = 55,515.18 : x
2. Step 2: Convert to fraction form
   139,871.82/209,658.33 = 55,515.18/x
3. Step 3: Cross multiply
   139,871.82x = 209,658.33 × 55,515.18
4. Step 4: Simplify right side
   139,871.82x = 11,639,219,928.45
5. Step 5: Solve for x
   x = 11,639,219,928.45/139,871.82
6. Step 6: Final answer
   x = 83,213.47