Finding the Fourth Proportional to 9,619.48, 13,274.62 and 5,428.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,619.48 : 13,274.62 = 5,428.12 : x
2. Step 2: Convert to fraction form
   9,619.48/13,274.62 = 5,428.12/x
3. Step 3: Cross multiply
   9,619.48x = 13,274.62 × 5,428.12
4. Step 4: Simplify right side
   9,619.48x = 72,056,230.31
5. Step 5: Solve for x
   x = 72,056,230.31/9,619.48
6. Step 6: Final answer
   x = 7,490.66