Finding the Fourth Proportional to 39,892.39, 55,051.22 and 21,987.41

Step by Step Solution

1. Step 1: Write the proportion equation
   39,892.39 : 55,051.22 = 21,987.41 : x
2. Step 2: Convert to fraction form
   39,892.39/55,051.22 = 21,987.41/x
3. Step 3: Cross multiply
   39,892.39x = 55,051.22 × 21,987.41
4. Step 4: Simplify right side
   39,892.39x = 1,210,433,469.88
5. Step 5: Solve for x
   x = 1,210,433,469.88/39,892.39
6. Step 6: Final answer
   x = 30,342.47