Finding the Fourth Proportional to 9,188.03, 12,679.61 and 5,209.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,188.03 : 12,679.61 = 5,209.05 : x
2. Step 2: Convert to fraction form
   9,188.03/12,679.61 = 5,209.05/x
3. Step 3: Cross multiply
   9,188.03x = 12,679.61 × 5,209.05
4. Step 4: Simplify right side
   9,188.03x = 66,048,696.43
5. Step 5: Solve for x
   x = 66,048,696.43/9,188.03
6. Step 6: Final answer
   x = 7,188.56