Finding the Fourth Proportional to 30,972, 42,741.72 and 16,825.08

Step by Step Solution

1. Step 1: Write the proportion equation
   30,972 : 42,741.72 = 16,825.08 : x
2. Step 2: Convert to fraction form
   30,972/42,741.72 = 16,825.08/x
3. Step 3: Cross multiply
   30,972x = 42,741.72 × 16,825.08
4. Step 4: Simplify right side
   30,972x = 719,132,858.34
5. Step 5: Solve for x
   x = 719,132,858.34/30,972
6. Step 6: Final answer
   x = 23,218.81