Finding the Fourth Proportional to 245,719.31, 339,103.55 and 138,296.30

Step by Step Solution

1. Step 1: Write the proportion equation
   245,719.31 : 339,103.55 = 138,296.30 : x
2. Step 2: Convert to fraction form
   245,719.31/339,103.55 = 138,296.30/x
3. Step 3: Cross multiply
   245,719.31x = 339,103.55 × 138,296.30
4. Step 4: Simplify right side
   245,719.31x = 46,896,763,894.87
5. Step 5: Solve for x
   x = 46,896,763,894.87/245,719.31
6. Step 6: Final answer
   x = 190,855.02