Finding the Fourth Proportional to 12,698.34, 17,532.38 and 7,920.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,698.34 : 17,532.38 = 7,920.16 : x
2. Step 2: Convert to fraction form
   12,698.34/17,532.38 = 7,920.16/x
3. Step 3: Cross multiply
   12,698.34x = 17,532.38 × 7,920.16
4. Step 4: Simplify right side
   12,698.34x = 138,859,254.78
5. Step 5: Solve for x
   x = 138,859,254.78/12,698.34
6. Step 6: Final answer
   x = 10,935.23