Finding the Fourth Proportional to 13,071.60, 18,036.36 and 7,767.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,071.60 : 18,036.36 = 7,767.72 : x
2. Step 2: Convert to fraction form
   13,071.60/18,036.36 = 7,767.72/x
3. Step 3: Cross multiply
   13,071.60x = 18,036.36 × 7,767.72
4. Step 4: Simplify right side
   13,071.60x = 140,101,394.30
5. Step 5: Solve for x
   x = 140,101,394.30/13,071.60
6. Step 6: Final answer
   x = 10,718.00