Finding the Fourth Proportional to 31,019.27, 42,783.65 and 19,678.97

Step by Step Solution

1. Step 1: Write the proportion equation
   31,019.27 : 42,783.65 = 19,678.97 : x
2. Step 2: Convert to fraction form
   31,019.27/42,783.65 = 19,678.97/x
3. Step 3: Cross multiply
   31,019.27x = 42,783.65 × 19,678.97
4. Step 4: Simplify right side
   31,019.27x = 841,938,247.20
5. Step 5: Solve for x
   x = 841,938,247.20/31,019.27
6. Step 6: Final answer
   x = 27,142.43