Finding the Fourth Proportional to 9,965.40, 14,920.15 and 5,274.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,965.40 : 14,920.15 = 5,274.80 : x
2. Step 2: Convert to fraction form
   9,965.40/14,920.15 = 5,274.80/x
3. Step 3: Cross multiply
   9,965.40x = 14,920.15 × 5,274.80
4. Step 4: Simplify right side
   9,965.40x = 78,700,869.20
5. Step 5: Solve for x
   x = 78,700,869.20/9,965.40
6. Step 6: Final answer
   x = 7,897.41