Finding the Fourth Proportional to 30,706.40, 42,371.06 and 19,371.62

Step by Step Solution

1. Step 1: Write the proportion equation
   30,706.40 : 42,371.06 = 19,371.62 : x
2. Step 2: Convert to fraction form
   30,706.40/42,371.06 = 19,371.62/x
3. Step 3: Cross multiply
   30,706.40x = 42,371.06 × 19,371.62
4. Step 4: Simplify right side
   30,706.40x = 820,796,073.32
5. Step 5: Solve for x
   x = 820,796,073.32/30,706.40
6. Step 6: Final answer
   x = 26,730.46