Finding the Fourth Proportional to 245,520.72, 338,815.25 and 138,090.71

Step by Step Solution

1. Step 1: Write the proportion equation
   245,520.72 : 338,815.25 = 138,090.71 : x
2. Step 2: Convert to fraction form
   245,520.72/338,815.25 = 138,090.71/x
3. Step 3: Cross multiply
   245,520.72x = 338,815.25 × 138,090.71
4. Step 4: Simplify right side
   245,520.72x = 46,787,238,431.33
5. Step 5: Solve for x
   x = 46,787,238,431.33/245,520.72
6. Step 6: Final answer
   x = 190,563.30