Finding the Fourth Proportional to 9,817.31, 13,556.07 and 9,105.01

Step by Step Solution

1. Step 1: Write the proportion equation
   9,817.31 : 13,556.07 = 9,105.01 : x
2. Step 2: Convert to fraction form
   9,817.31/13,556.07 = 9,105.01/x
3. Step 3: Cross multiply
   9,817.31x = 13,556.07 × 9,105.01
4. Step 4: Simplify right side
   9,817.31x = 123,428,039.61
5. Step 5: Solve for x
   x = 123,428,039.61/9,817.31
6. Step 6: Final answer
   x = 12,572.49