Finding the Fourth Proportional to 40,145.70, 55,398.71 and 21,992.83

Step by Step Solution

1. Step 1: Write the proportion equation
   40,145.70 : 55,398.71 = 21,992.83 : x
2. Step 2: Convert to fraction form
   40,145.70/55,398.71 = 21,992.83/x
3. Step 3: Cross multiply
   40,145.70x = 55,398.71 × 21,992.83
4. Step 4: Simplify right side
   40,145.70x = 1,218,374,411.25
5. Step 5: Solve for x
   x = 1,218,374,411.25/40,145.70
6. Step 6: Final answer
   x = 30,348.81