Finding the Fourth Proportional to 39,990.58, 55,186.56 and 22,085.23

Step by Step Solution

1. Step 1: Write the proportion equation
   39,990.58 : 55,186.56 = 22,085.23 : x
2. Step 2: Convert to fraction form
   39,990.58/55,186.56 = 22,085.23/x
3. Step 3: Cross multiply
   39,990.58x = 55,186.56 × 22,085.23
4. Step 4: Simplify right side
   39,990.58x = 1,218,807,870.51
5. Step 5: Solve for x
   x = 1,218,807,870.51/39,990.58
6. Step 6: Final answer
   x = 30,477.37