Finding the Fourth Proportional to 9,109.60, 12,570.99 and 5,130.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.60 : 12,570.99 = 5,130.74 : x
2. Step 2: Convert to fraction form
   9,109.60/12,570.99 = 5,130.74/x
3. Step 3: Cross multiply
   9,109.60x = 12,570.99 × 5,130.74
4. Step 4: Simplify right side
   9,109.60x = 64,498,493.42
5. Step 5: Solve for x
   x = 64,498,493.42/9,109.60
6. Step 6: Final answer
   x = 7,080.28