Finding the Fourth Proportional to 31,109.34, 42,929.82 and 17,680.36

Step by Step Solution

1. Step 1: Write the proportion equation
   31,109.34 : 42,929.82 = 17,680.36 : x
2. Step 2: Convert to fraction form
   31,109.34/42,929.82 = 17,680.36/x
3. Step 3: Cross multiply
   31,109.34x = 42,929.82 × 17,680.36
4. Step 4: Simplify right side
   31,109.34x = 759,014,672.34
5. Step 5: Solve for x
   x = 759,014,672.34/31,109.34
6. Step 6: Final answer
   x = 24,398.29