Finding the Fourth Proportional to 30,709.43, 42,384.06 and 19,385.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,709.43 : 42,384.06 = 19,385.12 : x
2. Step 2: Convert to fraction form
   30,709.43/42,384.06 = 19,385.12/x
3. Step 3: Cross multiply
   30,709.43x = 42,384.06 × 19,385.12
4. Step 4: Simplify right side
   30,709.43x = 821,620,195.15
5. Step 5: Solve for x
   x = 821,620,195.15/30,709.43
6. Step 6: Final answer
   x = 26,754.66