Finding the Fourth Proportional to 9,109.40, 12,570.18 and 5,130.14

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.40 : 12,570.18 = 5,130.14 : x
2. Step 2: Convert to fraction form
   9,109.40/12,570.18 = 5,130.14/x
3. Step 3: Cross multiply
   9,109.40x = 12,570.18 × 5,130.14
4. Step 4: Simplify right side
   9,109.40x = 64,486,783.23
5. Step 5: Solve for x
   x = 64,486,783.23/9,109.40
6. Step 6: Final answer
   x = 7,079.15