Finding the Fourth Proportional to 40,105.70, 55,346.56 and 21,958.02

Step by Step Solution

1. Step 1: Write the proportion equation
   40,105.70 : 55,346.56 = 21,958.02 : x
2. Step 2: Convert to fraction form
   40,105.70/55,346.56 = 21,958.02/x
3. Step 3: Cross multiply
   40,105.70x = 55,346.56 × 21,958.02
4. Step 4: Simplify right side
   40,105.70x = 1,215,300,871.41
5. Step 5: Solve for x
   x = 1,215,300,871.41/40,105.70
6. Step 6: Final answer
   x = 30,302.45