Finding the Fourth Proportional to 9,109.78, 12,571.25 and 5,130.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.78 : 12,571.25 = 5,130.92 : x
2. Step 2: Convert to fraction form
   9,109.78/12,571.25 = 5,130.92/x
3. Step 3: Cross multiply
   9,109.78x = 12,571.25 × 5,130.92
4. Step 4: Simplify right side
   9,109.78x = 64,502,122.31
5. Step 5: Solve for x
   x = 64,502,122.31/9,109.78
6. Step 6: Final answer
   x = 7,080.54