Finding the Fourth Proportional to 30,447.28, 42,002.72 and 19,111.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,447.28 : 42,002.72 = 19,111.12 : x
2. Step 2: Convert to fraction form
   30,447.28/42,002.72 = 19,111.12/x
3. Step 3: Cross multiply
   30,447.28x = 42,002.72 × 19,111.12
4. Step 4: Simplify right side
   30,447.28x = 802,719,022.25
5. Step 5: Solve for x
   x = 802,719,022.25/30,447.28
6. Step 6: Final answer
   x = 26,364.23