Finding the Fourth Proportional to 31,136.78, 42,917.54 and 22,065.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,136.78 : 42,917.54 = 22,065.18 : x
2. Step 2: Convert to fraction form
   31,136.78/42,917.54 = 22,065.18/x
3. Step 3: Cross multiply
   31,136.78x = 42,917.54 × 22,065.18
4. Step 4: Simplify right side
   31,136.78x = 946,983,134.93
5. Step 5: Solve for x
   x = 946,983,134.93/31,136.78
6. Step 6: Final answer
   x = 30,413.66