Finding the Fourth Proportional to 9,321.60, 12,863.94 and 5,072.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.60 : 12,863.94 = 5,072.80 : x
2. Step 2: Convert to fraction form
   9,321.60/12,863.94 = 5,072.80/x
3. Step 3: Cross multiply
   9,321.60x = 12,863.94 × 5,072.80
4. Step 4: Simplify right side
   9,321.60x = 65,256,194.83
5. Step 5: Solve for x
   x = 65,256,194.83/9,321.60
6. Step 6: Final answer
   x = 7,000.54