Finding the Fourth Proportional to 12,978.10, 17,911.52 and 7,313.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.10 : 17,911.52 = 7,313.95 : x
2. Step 2: Convert to fraction form
   12,978.10/17,911.52 = 7,313.95/x
3. Step 3: Cross multiply
   12,978.10x = 17,911.52 × 7,313.95
4. Step 4: Simplify right side
   12,978.10x = 131,003,961.70
5. Step 5: Solve for x
   x = 131,003,961.70/12,978.10
6. Step 6: Final answer
   x = 10,094.23