Finding the Fourth Proportional to 9,109.08, 12,570.39 and 5,130.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.08 : 12,570.39 = 5,130.57 : x
2. Step 2: Convert to fraction form
   9,109.08/12,570.39 = 5,130.57/x
3. Step 3: Cross multiply
   9,109.08x = 12,570.39 × 5,130.57
4. Step 4: Simplify right side
   9,109.08x = 64,493,265.82
5. Step 5: Solve for x
   x = 64,493,265.82/9,109.08
6. Step 6: Final answer
   x = 7,080.11