Finding the Fourth Proportional to 31,019.83, 42,784.43 and 19,679.54

Step by Step Solution

1. Step 1: Write the proportion equation
   31,019.83 : 42,784.43 = 19,679.54 : x
2. Step 2: Convert to fraction form
   31,019.83/42,784.43 = 19,679.54/x
3. Step 3: Cross multiply
   31,019.83x = 42,784.43 × 19,679.54
4. Step 4: Simplify right side
   31,019.83x = 841,977,589.24
5. Step 5: Solve for x
   x = 841,977,589.24/31,019.83
6. Step 6: Final answer
   x = 27,143.21