Finding the Fourth Proportional to 15,477.89, 21,339.05 and 12,610.49

Step by Step Solution

1. Step 1: Write the proportion equation
   15,477.89 : 21,339.05 = 12,610.49 : x
2. Step 2: Convert to fraction form
   15,477.89/21,339.05 = 12,610.49/x
3. Step 3: Cross multiply
   15,477.89x = 21,339.05 × 12,610.49
4. Step 4: Simplify right side
   15,477.89x = 269,095,706.89
5. Step 5: Solve for x
   x = 269,095,706.89/15,477.89
6. Step 6: Final answer
   x = 17,385.82