Finding the Fourth Proportional to 42,459.48, 63,680.82 and 12,870.36

Step by Step Solution

1. Step 1: Write the proportion equation
   42,459.48 : 63,680.82 = 12,870.36 : x
2. Step 2: Convert to fraction form
   42,459.48/63,680.82 = 12,870.36/x
3. Step 3: Cross multiply
   42,459.48x = 63,680.82 × 12,870.36
4. Step 4: Simplify right side
   42,459.48x = 819,595,078.50
5. Step 5: Solve for x
   x = 819,595,078.50/42,459.48
6. Step 6: Final answer
   x = 19,302.99