Finding the Fourth Proportional to 13,340.08, 19,960.84 and 10,978.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,340.08 : 19,960.84 = 10,978.12 : x
2. Step 2: Convert to fraction form
   13,340.08/19,960.84 = 10,978.12/x
3. Step 3: Cross multiply
   13,340.08x = 19,960.84 × 10,978.12
4. Step 4: Simplify right side
   13,340.08x = 219,132,496.82
5. Step 5: Solve for x
   x = 219,132,496.82/13,340.08
6. Step 6: Final answer
   x = 16,426.63