Finding the Fourth Proportional to 30,774.87, 42,479.71 and 19,142.15

Step by Step Solution

1. Step 1: Write the proportion equation
   30,774.87 : 42,479.71 = 19,142.15 : x
2. Step 2: Convert to fraction form
   30,774.87/42,479.71 = 19,142.15/x
3. Step 3: Cross multiply
   30,774.87x = 42,479.71 × 19,142.15
4. Step 4: Simplify right side
   30,774.87x = 813,152,720.52
5. Step 5: Solve for x
   x = 813,152,720.52/30,774.87
6. Step 6: Final answer
   x = 26,422.62