Finding the Fourth Proportional to 112,325.31, 154,745.49 and 78,272

Step by Step Solution

1. Step 1: Write the proportion equation
   112,325.31 : 154,745.49 = 78,272 : x
2. Step 2: Convert to fraction form
   112,325.31/154,745.49 = 78,272/x
3. Step 3: Cross multiply
   112,325.31x = 154,745.49 × 78,272
4. Step 4: Simplify right side
   112,325.31x = 12,112,238,993.28
5. Step 5: Solve for x
   x = 12,112,238,993.28/112,325.31
6. Step 6: Final answer
   x = 107,831.79