Finding the Fourth Proportional to 39,018.61, 53,845.59 and 21,113.61

Step by Step Solution

1. Step 1: Write the proportion equation
   39,018.61 : 53,845.59 = 21,113.61 : x
2. Step 2: Convert to fraction form
   39,018.61/53,845.59 = 21,113.61/x
3. Step 3: Cross multiply
   39,018.61x = 53,845.59 × 21,113.61
4. Step 4: Simplify right side
   39,018.61x = 1,136,874,664.73
5. Step 5: Solve for x
   x = 1,136,874,664.73/39,018.61
6. Step 6: Final answer
   x = 29,136.73