Finding the Fourth Proportional to 245,447.61, 338,719.72 and 138,016.70

Step by Step Solution

1. Step 1: Write the proportion equation
   245,447.61 : 338,719.72 = 138,016.70 : x
2. Step 2: Convert to fraction form
   245,447.61/338,719.72 = 138,016.70/x
3. Step 3: Cross multiply
   245,447.61x = 338,719.72 × 138,016.70
4. Step 4: Simplify right side
   245,447.61x = 46,748,978,622.33
5. Step 5: Solve for x
   x = 46,748,978,622.33/245,447.61
6. Step 6: Final answer
   x = 190,464.18