Finding the Fourth Proportional to 42,568.31, 63,852.27 and 12,986.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,568.31 : 63,852.27 = 12,986.04 : x
2. Step 2: Convert to fraction form
   42,568.31/63,852.27 = 12,986.04/x
3. Step 3: Cross multiply
   42,568.31x = 63,852.27 × 12,986.04
4. Step 4: Simplify right side
   42,568.31x = 829,188,132.31
5. Step 5: Solve for x
   x = 829,188,132.31/42,568.31
6. Step 6: Final answer
   x = 19,479.00