Finding the Fourth Proportional to 12,320.33, 16,990.52 and 9,810.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,320.33 : 16,990.52 = 9,810.72 : x
2. Step 2: Convert to fraction form
   12,320.33/16,990.52 = 9,810.72/x
3. Step 3: Cross multiply
   12,320.33x = 16,990.52 × 9,810.72
4. Step 4: Simplify right side
   12,320.33x = 166,689,185.32
5. Step 5: Solve for x
   x = 166,689,185.32/12,320.33
6. Step 6: Final answer
   x = 13,529.61