Finding the Fourth Proportional to 12,989.82, 17,924.63 and 7,955.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,989.82 : 17,924.63 = 7,955.47 : x
2. Step 2: Convert to fraction form
   12,989.82/17,924.63 = 7,955.47/x
3. Step 3: Cross multiply
   12,989.82x = 17,924.63 × 7,955.47
4. Step 4: Simplify right side
   12,989.82x = 142,598,856.23
5. Step 5: Solve for x
   x = 142,598,856.23/12,989.82
6. Step 6: Final answer
   x = 10,977.74