Finding the Fourth Proportional to 30,956.72, 42,736.01 and 19,637.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,956.72 : 42,736.01 = 19,637.78 : x
2. Step 2: Convert to fraction form
   30,956.72/42,736.01 = 19,637.78/x
3. Step 3: Cross multiply
   30,956.72x = 42,736.01 × 19,637.78
4. Step 4: Simplify right side
   30,956.72x = 839,240,050.59
5. Step 5: Solve for x
   x = 839,240,050.59/30,956.72
6. Step 6: Final answer
   x = 27,110.11