Finding the Fourth Proportional to 9,189.52, 12,681.69 and 5,210.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,189.52 : 12,681.69 = 5,210.55 : x
2. Step 2: Convert to fraction form
   9,189.52/12,681.69 = 5,210.55/x
3. Step 3: Cross multiply
   9,189.52x = 12,681.69 × 5,210.55
4. Step 4: Simplify right side
   9,189.52x = 66,078,579.83
5. Step 5: Solve for x
   x = 66,078,579.83/9,189.52
6. Step 6: Final answer
   x = 7,190.65