Finding the Fourth Proportional to 10,613.96, 15,918.89 and 10,087.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,613.96 : 15,918.89 = 10,087.12 : x
2. Step 2: Convert to fraction form
   10,613.96/15,918.89 = 10,087.12/x
3. Step 3: Cross multiply
   10,613.96x = 15,918.89 × 10,087.12
4. Step 4: Simplify right side
   10,613.96x = 160,575,663.46
5. Step 5: Solve for x
   x = 160,575,663.46/10,613.96
6. Step 6: Final answer
   x = 15,128.73