Finding the Fourth Proportional to 30,969.59, 42,714.49 and 21,425.36

Step by Step Solution

1. Step 1: Write the proportion equation
   30,969.59 : 42,714.49 = 21,425.36 : x
2. Step 2: Convert to fraction form
   30,969.59/42,714.49 = 21,425.36/x
3. Step 3: Cross multiply
   30,969.59x = 42,714.49 × 21,425.36
4. Step 4: Simplify right side
   30,969.59x = 915,173,218.34
5. Step 5: Solve for x
   x = 915,173,218.34/30,969.59
6. Step 6: Final answer
   x = 29,550.71