Finding the Fourth Proportional to 31,451.86, 43,422.96 and 21,646

Step by Step Solution

1. Step 1: Write the proportion equation
   31,451.86 : 43,422.96 = 21,646 : x
2. Step 2: Convert to fraction form
   31,451.86/43,422.96 = 21,646/x
3. Step 3: Cross multiply
   31,451.86x = 43,422.96 × 21,646
4. Step 4: Simplify right side
   31,451.86x = 939,933,392.16
5. Step 5: Solve for x
   x = 939,933,392.16/31,451.86
6. Step 6: Final answer
   x = 29,884.83