Finding the Fourth Proportional to 9,666.90, 13,341.43 and 5,419.11

Step by Step Solution

1. Step 1: Write the proportion equation
   9,666.90 : 13,341.43 = 5,419.11 : x
2. Step 2: Convert to fraction form
   9,666.90/13,341.43 = 5,419.11/x
3. Step 3: Cross multiply
   9,666.90x = 13,341.43 × 5,419.11
4. Step 4: Simplify right side
   9,666.90x = 72,298,683.50
5. Step 5: Solve for x
   x = 72,298,683.50/9,666.90
6. Step 6: Final answer
   x = 7,478.99