Finding the Fourth Proportional to 42,386.38, 63,580.66 and 12,805.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42,386.38 : 63,580.66 = 12,805.18 : x
2. Step 2: Convert to fraction form
   42,386.38/63,580.66 = 12,805.18/x
3. Step 3: Cross multiply
   42,386.38x = 63,580.66 × 12,805.18
4. Step 4: Simplify right side
   42,386.38x = 814,161,795.82
5. Step 5: Solve for x
   x = 814,161,795.82/42,386.38
6. Step 6: Final answer
   x = 19,208.10