Finding the Fourth Proportional to 31,056.37, 42,863.86 and 19,739.05

Step by Step Solution

1. Step 1: Write the proportion equation
   31,056.37 : 42,863.86 = 19,739.05 : x
2. Step 2: Convert to fraction form
   31,056.37/42,863.86 = 19,739.05/x
3. Step 3: Cross multiply
   31,056.37x = 42,863.86 × 19,739.05
4. Step 4: Simplify right side
   31,056.37x = 846,091,875.73
5. Step 5: Solve for x
   x = 846,091,875.73/31,056.37
6. Step 6: Final answer
   x = 27,243.75