Finding the Fourth Proportional to 12,906.32, 17,810.72 and 7,317.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,906.32 : 17,810.72 = 7,317.28 : x
2. Step 2: Convert to fraction form
   12,906.32/17,810.72 = 7,317.28/x
3. Step 3: Cross multiply
   12,906.32x = 17,810.72 × 7,317.28
4. Step 4: Simplify right side
   12,906.32x = 130,326,025.24
5. Step 5: Solve for x
   x = 130,326,025.24/12,906.32
6. Step 6: Final answer
   x = 10,097.85