Finding the Fourth Proportional to 9,164.32, 12,608.40 and 7,064.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,164.32 : 12,608.40 = 7,064.80 : x
2. Step 2: Convert to fraction form
   9,164.32/12,608.40 = 7,064.80/x
3. Step 3: Cross multiply
   9,164.32x = 12,608.40 × 7,064.80
4. Step 4: Simplify right side
   9,164.32x = 89,075,824.32
5. Step 5: Solve for x
   x = 89,075,824.32/9,164.32
6. Step 6: Final answer
   x = 9,719.85