Finding the Fourth Proportional to 42,136.38, 63,213.69 and 12,556.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,136.38 : 63,213.69 = 12,556.61 : x
2. Step 2: Convert to fraction form
   42,136.38/63,213.69 = 12,556.61/x
3. Step 3: Cross multiply
   42,136.38x = 63,213.69 × 12,556.61
4. Step 4: Simplify right side
   42,136.38x = 793,749,335.92
5. Step 5: Solve for x
   x = 793,749,335.92/42,136.38
6. Step 6: Final answer
   x = 18,837.63