Finding the Fourth Proportional to 12,978.18, 17,906.18 and 7,310.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.18 : 17,906.18 = 7,310.94 : x
2. Step 2: Convert to fraction form
   12,978.18/17,906.18 = 7,310.94/x
3. Step 3: Cross multiply
   12,978.18x = 17,906.18 × 7,310.94
4. Step 4: Simplify right side
   12,978.18x = 130,910,971.05
5. Step 5: Solve for x
   x = 130,910,971.05/12,978.18
6. Step 6: Final answer
   x = 10,087.01