Finding the Fourth Proportional to 30,712.95, 42,395.94 and 19,380.42

Step by Step Solution

1. Step 1: Write the proportion equation
   30,712.95 : 42,395.94 = 19,380.42 : x
2. Step 2: Convert to fraction form
   30,712.95/42,395.94 = 19,380.42/x
3. Step 3: Cross multiply
   30,712.95x = 42,395.94 × 19,380.42
4. Step 4: Simplify right side
   30,712.95x = 821,651,123.49
5. Step 5: Solve for x
   x = 821,651,123.49/30,712.95
6. Step 6: Final answer
   x = 26,752.60