Finding the Fourth Proportional to 30,725.88, 42,402.56 and 18,789

Step by Step Solution

1. Step 1: Write the proportion equation
   30,725.88 : 42,402.56 = 18,789 : x
2. Step 2: Convert to fraction form
   30,725.88/42,402.56 = 18,789/x
3. Step 3: Cross multiply
   30,725.88x = 42,402.56 × 18,789
4. Step 4: Simplify right side
   30,725.88x = 796,701,699.84
5. Step 5: Solve for x
   x = 796,701,699.84/30,725.88
6. Step 6: Final answer
   x = 25,929.34