Finding the Fourth Proportional to 9,669.70, 13,343.00 and 5,419.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,669.70 : 13,343.00 = 5,419.78 : x
2. Step 2: Convert to fraction form
   9,669.70/13,343.00 = 5,419.78/x
3. Step 3: Cross multiply
   9,669.70x = 13,343.00 × 5,419.78
4. Step 4: Simplify right side
   9,669.70x = 72,316,064.08
5. Step 5: Solve for x
   x = 72,316,064.08/9,669.70
6. Step 6: Final answer
   x = 7,478.63