Finding the Fourth Proportional to 31,065.40, 42,847.12 and 19,725.06

Step by Step Solution

1. Step 1: Write the proportion equation
   31,065.40 : 42,847.12 = 19,725.06 : x
2. Step 2: Convert to fraction form
   31,065.40/42,847.12 = 19,725.06/x
3. Step 3: Cross multiply
   31,065.40x = 42,847.12 × 19,725.06
4. Step 4: Simplify right side
   31,065.40x = 845,162,012.83
5. Step 5: Solve for x
   x = 845,162,012.83/31,065.40
6. Step 6: Final answer
   x = 27,205.90