Finding the Fourth Proportional to 9,109.18, 12,570.96 and 5,130.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.18 : 12,570.96 = 5,130.60 : x
2. Step 2: Convert to fraction form
   9,109.18/12,570.96 = 5,130.60/x
3. Step 3: Cross multiply
   9,109.18x = 12,570.96 × 5,130.60
4. Step 4: Simplify right side
   9,109.18x = 64,496,567.38
5. Step 5: Solve for x
   x = 64,496,567.38/9,109.18
6. Step 6: Final answer
   x = 7,080.39