Finding the Fourth Proportional to 9,109.17, 12,570.42 and 5,130.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.17 : 12,570.42 = 5,130.05 : x
2. Step 2: Convert to fraction form
   9,109.17/12,570.42 = 5,130.05/x
3. Step 3: Cross multiply
   9,109.17x = 12,570.42 × 5,130.05
4. Step 4: Simplify right side
   9,109.17x = 64,486,851.69
5. Step 5: Solve for x
   x = 64,486,851.69/9,109.17
6. Step 6: Final answer
   x = 7,079.33