Finding the Fourth Proportional to 103,515.36, 142,749.72 and 65,724

Step by Step Solution

1. Step 1: Write the proportion equation
   103,515.36 : 142,749.72 = 65,724 : x
2. Step 2: Convert to fraction form
   103,515.36/142,749.72 = 65,724/x
3. Step 3: Cross multiply
   103,515.36x = 142,749.72 × 65,724
4. Step 4: Simplify right side
   103,515.36x = 9,382,082,597.28
5. Step 5: Solve for x
   x = 9,382,082,597.28/103,515.36
6. Step 6: Final answer
   x = 90,634.69