Finding the Fourth Proportional to 13,816.40, 19,066.56 and 7,528.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,816.40 : 19,066.56 = 7,528.72 : x
2. Step 2: Convert to fraction form
   13,816.40/19,066.56 = 7,528.72/x
3. Step 3: Cross multiply
   13,816.40x = 19,066.56 × 7,528.72
4. Step 4: Simplify right side
   13,816.40x = 143,546,791.60
5. Step 5: Solve for x
   x = 143,546,791.60/13,816.40
6. Step 6: Final answer
   x = 10,389.59