Finding the Fourth Proportional to 30,725.72, 42,407.10 and 17,978.16

Step by Step Solution

1. Step 1: Write the proportion equation
   30,725.72 : 42,407.10 = 17,978.16 : x
2. Step 2: Convert to fraction form
   30,725.72/42,407.10 = 17,978.16/x
3. Step 3: Cross multiply
   30,725.72x = 42,407.10 × 17,978.16
4. Step 4: Simplify right side
   30,725.72x = 762,401,628.94
5. Step 5: Solve for x
   x = 762,401,628.94/30,725.72
6. Step 6: Final answer
   x = 24,813.14