Finding the Fourth Proportional to 9,612.02, 13,264.60 and 5,420.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,612.02 : 13,264.60 = 5,420.28 : x
2. Step 2: Convert to fraction form
   9,612.02/13,264.60 = 5,420.28/x
3. Step 3: Cross multiply
   9,612.02x = 13,264.60 × 5,420.28
4. Step 4: Simplify right side
   9,612.02x = 71,897,846.09
5. Step 5: Solve for x
   x = 71,897,846.09/9,612.02
6. Step 6: Final answer
   x = 7,479.99