Finding the Fourth Proportional to 10,699.47, 14,769.33 and 9,578.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,699.47 : 14,769.33 = 9,578.40 : x
2. Step 2: Convert to fraction form
   10,699.47/14,769.33 = 9,578.40/x
3. Step 3: Cross multiply
   10,699.47x = 14,769.33 × 9,578.40
4. Step 4: Simplify right side
   10,699.47x = 141,466,459.17
5. Step 5: Solve for x
   x = 141,466,459.17/10,699.47
6. Step 6: Final answer
   x = 13,221.82