Finding the Fourth Proportional to 9,109.10, 12,570.42 and 5,130.26

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.10 : 12,570.42 = 5,130.26 : x
2. Step 2: Convert to fraction form
   9,109.10/12,570.42 = 5,130.26/x
3. Step 3: Cross multiply
   9,109.10x = 12,570.42 × 5,130.26
4. Step 4: Simplify right side
   9,109.10x = 64,489,460.06
5. Step 5: Solve for x
   x = 64,489,460.06/9,109.10
6. Step 6: Final answer
   x = 7,079.68