Finding the Fourth Proportional to 13,036.06, 17,990.05 and 7,728.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,036.06 : 17,990.05 = 7,728.94 : x
2. Step 2: Convert to fraction form
   13,036.06/17,990.05 = 7,728.94/x
3. Step 3: Cross multiply
   13,036.06x = 17,990.05 × 7,728.94
4. Step 4: Simplify right side
   13,036.06x = 139,043,927.10
5. Step 5: Solve for x
   x = 139,043,927.10/13,036.06
6. Step 6: Final answer
   x = 10,666.10