Finding the Fourth Proportional to 173,407.30, 259,673.55 and 138,415.30

Step by Step Solution

1. Step 1: Write the proportion equation
   173,407.30 : 259,673.55 = 138,415.30 : x
2. Step 2: Convert to fraction form
   173,407.30/259,673.55 = 138,415.30/x
3. Step 3: Cross multiply
   173,407.30x = 259,673.55 × 138,415.30
4. Step 4: Simplify right side
   173,407.30x = 35,942,792,325.32
5. Step 5: Solve for x
   x = 35,942,792,325.32/173,407.30
6. Step 6: Final answer
   x = 207,273.81