Finding the Fourth Proportional to 7,891.30, 10,856.46 and 7,672.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,891.30 : 10,856.46 = 7,672.60 : x
2. Step 2: Convert to fraction form
   7,891.30/10,856.46 = 7,672.60/x
3. Step 3: Cross multiply
   7,891.30x = 10,856.46 × 7,672.60
4. Step 4: Simplify right side
   7,891.30x = 83,297,275.00
5. Step 5: Solve for x
   x = 83,297,275.00/7,891.30
6. Step 6: Final answer
   x = 10,555.58