Finding the Fourth Proportional to 13,280.36, 18,326.25 and 7,312.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,280.36 : 18,326.25 = 7,312.28 : x
2. Step 2: Convert to fraction form
   13,280.36/18,326.25 = 7,312.28/x
3. Step 3: Cross multiply
   13,280.36x = 18,326.25 × 7,312.28
4. Step 4: Simplify right side
   13,280.36x = 134,006,579.72
5. Step 5: Solve for x
   x = 134,006,579.72/13,280.36
6. Step 6: Final answer
   x = 10,090.59