Finding the Fourth Proportional to 42,568.70, 63,863.04 and 12,986.53

Step by Step Solution

1. Step 1: Write the proportion equation
   42,568.70 : 63,863.04 = 12,986.53 : x
2. Step 2: Convert to fraction form
   42,568.70/63,863.04 = 12,986.53/x
3. Step 3: Cross multiply
   42,568.70x = 63,863.04 × 12,986.53
4. Step 4: Simplify right side
   42,568.70x = 829,359,109.98
5. Step 5: Solve for x
   x = 829,359,109.98/42,568.70
6. Step 6: Final answer
   x = 19,482.84