Finding the Fourth Proportional to 11,820.16, 17,708.10 and 10,603

Step by Step Solution

1. Step 1: Write the proportion equation
   11,820.16 : 17,708.10 = 10,603 : x
2. Step 2: Convert to fraction form
   11,820.16/17,708.10 = 10,603/x
3. Step 3: Cross multiply
   11,820.16x = 17,708.10 × 10,603
4. Step 4: Simplify right side
   11,820.16x = 187,758,984.30
5. Step 5: Solve for x
   x = 187,758,984.30/11,820.16
6. Step 6: Final answer
   x = 15,884.64