Finding the Fourth Proportional to 30,815, 42,524.70 and 19,643.48

Step by Step Solution

1. Step 1: Write the proportion equation
   30,815 : 42,524.70 = 19,643.48 : x
2. Step 2: Convert to fraction form
   30,815/42,524.70 = 19,643.48/x
3. Step 3: Cross multiply
   30,815x = 42,524.70 × 19,643.48
4. Step 4: Simplify right side
   30,815x = 835,333,093.96
5. Step 5: Solve for x
   x = 835,333,093.96/30,815
6. Step 6: Final answer
   x = 27,108.00