Finding the Fourth Proportional to 31,019.43, 42,783.90 and 19,679.16

Step by Step Solution

1. Step 1: Write the proportion equation
   31,019.43 : 42,783.90 = 19,679.16 : x
2. Step 2: Convert to fraction form
   31,019.43/42,783.90 = 19,679.16/x
3. Step 3: Cross multiply
   31,019.43x = 42,783.90 × 19,679.16
4. Step 4: Simplify right side
   31,019.43x = 841,951,213.52
5. Step 5: Solve for x
   x = 841,951,213.52/31,019.43
6. Step 6: Final answer
   x = 27,142.70