Finding the Fourth Proportional to 16,915.60, 23,343.12 and 9,361.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,915.60 : 23,343.12 = 9,361.72 : x
2. Step 2: Convert to fraction form
   16,915.60/23,343.12 = 9,361.72/x
3. Step 3: Cross multiply
   16,915.60x = 23,343.12 × 9,361.72
4. Step 4: Simplify right side
   16,915.60x = 218,531,753.37
5. Step 5: Solve for x
   x = 218,531,753.37/16,915.60
6. Step 6: Final answer
   x = 12,918.95