Finding the Fourth Proportional to 13,280.16, 18,327.15 and 7,312.39

Step by Step Solution

1. Step 1: Write the proportion equation
   13,280.16 : 18,327.15 = 7,312.39 : x
2. Step 2: Convert to fraction form
   13,280.16/18,327.15 = 7,312.39/x
3. Step 3: Cross multiply
   13,280.16x = 18,327.15 × 7,312.39
4. Step 4: Simplify right side
   13,280.16x = 134,015,268.39
5. Step 5: Solve for x
   x = 134,015,268.39/13,280.16
6. Step 6: Final answer
   x = 10,091.39