Finding the Fourth Proportional to 39,990.79, 55,187.37 and 22,086.55

Step by Step Solution

1. Step 1: Write the proportion equation
   39,990.79 : 55,187.37 = 22,086.55 : x
2. Step 2: Convert to fraction form
   39,990.79/55,187.37 = 22,086.55/x
3. Step 3: Cross multiply
   39,990.79x = 55,187.37 × 22,086.55
4. Step 4: Simplify right side
   39,990.79x = 1,218,898,606.87
5. Step 5: Solve for x
   x = 1,218,898,606.87/39,990.79
6. Step 6: Final answer
   x = 30,479.48