Finding the Fourth Proportional to 9,173.12, 12,649.60 and 7,851.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,173.12 : 12,649.60 = 7,851.20 : x
2. Step 2: Convert to fraction form
   9,173.12/12,649.60 = 7,851.20/x
3. Step 3: Cross multiply
   9,173.12x = 12,649.60 × 7,851.20
4. Step 4: Simplify right side
   9,173.12x = 99,314,539.52
5. Step 5: Solve for x
   x = 99,314,539.52/9,173.12
6. Step 6: Final answer
   x = 10,826.69