Finding the Fourth Proportional to 15,326.02, 21,161.72 and 12,355.12

Step by Step Solution

1. Step 1: Write the proportion equation
   15,326.02 : 21,161.72 = 12,355.12 : x
2. Step 2: Convert to fraction form
   15,326.02/21,161.72 = 12,355.12/x
3. Step 3: Cross multiply
   15,326.02x = 21,161.72 × 12,355.12
4. Step 4: Simplify right side
   15,326.02x = 261,455,590.01
5. Step 5: Solve for x
   x = 261,455,590.01/15,326.02
6. Step 6: Final answer
   x = 17,059.59