Finding the Fourth Proportional to 139,022.34, 208,501.53 and 82,878.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,022.34 : 208,501.53 = 82,878.30 : x
2. Step 2: Convert to fraction form
   139,022.34/208,501.53 = 82,878.30/x
3. Step 3: Cross multiply
   139,022.34x = 208,501.53 × 82,878.30
4. Step 4: Simplify right side
   139,022.34x = 17,280,252,353.80
5. Step 5: Solve for x
   x = 17,280,252,353.80/139,022.34
6. Step 6: Final answer
   x = 124,298.39