Finding the Fourth Proportional to 9,109.30, 12,570.88 and 5,130.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.30 : 12,570.88 = 5,130.48 : x
2. Step 2: Convert to fraction form
   9,109.30/12,570.88 = 5,130.48/x
3. Step 3: Cross multiply
   9,109.30x = 12,570.88 × 5,130.48
4. Step 4: Simplify right side
   9,109.30x = 64,494,648.42
5. Step 5: Solve for x
   x = 64,494,648.42/9,109.30
6. Step 6: Final answer
   x = 7,080.09