Finding the Fourth Proportional to 9,145.30, 12,618.40 and 5,368.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.30 : 12,618.40 = 5,368.28 : x
2. Step 2: Convert to fraction form
   9,145.30/12,618.40 = 5,368.28/x
3. Step 3: Cross multiply
   9,145.30x = 12,618.40 × 5,368.28
4. Step 4: Simplify right side
   9,145.30x = 67,739,104.35
5. Step 5: Solve for x
   x = 67,739,104.35/9,145.30
6. Step 6: Final answer
   x = 7,406.99