Finding the Fourth Proportional to 10,999.53, 15,181.83 and 9,228.06

Step by Step Solution

1. Step 1: Write the proportion equation
   10,999.53 : 15,181.83 = 9,228.06 : x
2. Step 2: Convert to fraction form
   10,999.53/15,181.83 = 9,228.06/x
3. Step 3: Cross multiply
   10,999.53x = 15,181.83 × 9,228.06
4. Step 4: Simplify right side
   10,999.53x = 140,098,838.15
5. Step 5: Solve for x
   x = 140,098,838.15/10,999.53
6. Step 6: Final answer
   x = 12,736.80