Finding the Fourth Proportional to 15,440.79, 21,300.06 and 9,392.89

Step by Step Solution

1. Step 1: Write the proportion equation
   15,440.79 : 21,300.06 = 9,392.89 : x
2. Step 2: Convert to fraction form
   15,440.79/21,300.06 = 9,392.89/x
3. Step 3: Cross multiply
   15,440.79x = 21,300.06 × 9,392.89
4. Step 4: Simplify right side
   15,440.79x = 200,069,082.58
5. Step 5: Solve for x
   x = 200,069,082.58/15,440.79
6. Step 6: Final answer
   x = 12,957.18