Finding the Fourth Proportional to 9,109.19, 12,570.73 and 5,130.37

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.19 : 12,570.73 = 5,130.37 : x
2. Step 2: Convert to fraction form
   9,109.19/12,570.73 = 5,130.37/x
3. Step 3: Cross multiply
   9,109.19x = 12,570.73 × 5,130.37
4. Step 4: Simplify right side
   9,109.19x = 64,492,498.96
5. Step 5: Solve for x
   x = 64,492,498.96/9,109.19
6. Step 6: Final answer
   x = 7,079.94