Finding the Fourth Proportional to 9,109.17, 12,569.73 and 5,130.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.17 : 12,569.73 = 5,130.20 : x
2. Step 2: Convert to fraction form
   9,109.17/12,569.73 = 5,130.20/x
3. Step 3: Cross multiply
   9,109.17x = 12,569.73 × 5,130.20
4. Step 4: Simplify right side
   9,109.17x = 64,485,166.00
5. Step 5: Solve for x
   x = 64,485,166.00/9,109.17
6. Step 6: Final answer
   x = 7,079.15