Finding the Fourth Proportional to 12,120.31, 16,722.01 and 9,878.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,120.31 : 16,722.01 = 9,878.33 : x
2. Step 2: Convert to fraction form
   12,120.31/16,722.01 = 9,878.33/x
3. Step 3: Cross multiply
   12,120.31x = 16,722.01 × 9,878.33
4. Step 4: Simplify right side
   12,120.31x = 165,185,533.04
5. Step 5: Solve for x
   x = 165,185,533.04/12,120.31
6. Step 6: Final answer
   x = 13,628.82