Finding the Fourth Proportional to 10,356.78, 14,192.76 and 9,360.30

Step by Step Solution

1. Step 1: Write the proportion equation
   10,356.78 : 14,192.76 = 9,360.30 : x
2. Step 2: Convert to fraction form
   10,356.78/14,192.76 = 9,360.30/x
3. Step 3: Cross multiply
   10,356.78x = 14,192.76 × 9,360.30
4. Step 4: Simplify right side
   10,356.78x = 132,848,397.06
5. Step 5: Solve for x
   x = 132,848,397.06/10,356.78
6. Step 6: Final answer
   x = 12,827.20