Finding the Fourth Proportional to 42,443.06, 63,670.71 and 12,863.21

Step by Step Solution

1. Step 1: Write the proportion equation
   42,443.06 : 63,670.71 = 12,863.21 : x
2. Step 2: Convert to fraction form
   42,443.06/63,670.71 = 12,863.21/x
3. Step 3: Cross multiply
   42,443.06x = 63,670.71 × 12,863.21
4. Step 4: Simplify right side
   42,443.06x = 819,009,371.11
5. Step 5: Solve for x
   x = 819,009,371.11/42,443.06
6. Step 6: Final answer
   x = 19,296.66