Finding the Fourth Proportional to 10,490.79, 14,478.71 and 9,605.01

Step by Step Solution

1. Step 1: Write the proportion equation
   10,490.79 : 14,478.71 = 9,605.01 : x
2. Step 2: Convert to fraction form
   10,490.79/14,478.71 = 9,605.01/x
3. Step 3: Cross multiply
   10,490.79x = 14,478.71 × 9,605.01
4. Step 4: Simplify right side
   10,490.79x = 139,068,106.31
5. Step 5: Solve for x
   x = 139,068,106.31/10,490.79
6. Step 6: Final answer
   x = 13,256.21