Finding the Fourth Proportional to 139,022.37, 208,501.56 and 82,878.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,022.37 : 208,501.56 = 82,878.30 : x
2. Step 2: Convert to fraction form
   139,022.37/208,501.56 = 82,878.30/x
3. Step 3: Cross multiply
   139,022.37x = 208,501.56 × 82,878.30
4. Step 4: Simplify right side
   139,022.37x = 17,280,254,840.15
5. Step 5: Solve for x
   x = 17,280,254,840.15/139,022.37
6. Step 6: Final answer
   x = 124,298.38