Finding the Fourth Proportional to 9,989.12, 14,967.28 and 3,411.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.12 : 14,967.28 = 3,411.72 : x
2. Step 2: Convert to fraction form
   9,989.12/14,967.28 = 3,411.72/x
3. Step 3: Cross multiply
   9,989.12x = 14,967.28 × 3,411.72
4. Step 4: Simplify right side
   9,989.12x = 51,064,172.79
5. Step 5: Solve for x
   x = 51,064,172.79/9,989.12
6. Step 6: Final answer
   x = 5,111.98