Finding the Fourth Proportional to 39,881.72, 55,034.78 and 21,973.83

Step by Step Solution

1. Step 1: Write the proportion equation
   39,881.72 : 55,034.78 = 21,973.83 : x
2. Step 2: Convert to fraction form
   39,881.72/55,034.78 = 21,973.83/x
3. Step 3: Cross multiply
   39,881.72x = 55,034.78 × 21,973.83
4. Step 4: Simplify right side
   39,881.72x = 1,209,324,789.94
5. Step 5: Solve for x
   x = 1,209,324,789.94/39,881.72
6. Step 6: Final answer
   x = 30,322.79