Finding the Fourth Proportional to 23,090.29, 31,864.55 and 12,479.90

Step by Step Solution

1. Step 1: Write the proportion equation
   23,090.29 : 31,864.55 = 12,479.90 : x
2. Step 2: Convert to fraction form
   23,090.29/31,864.55 = 12,479.90/x
3. Step 3: Cross multiply
   23,090.29x = 31,864.55 × 12,479.90
4. Step 4: Simplify right side
   23,090.29x = 397,666,175.82
5. Step 5: Solve for x
   x = 397,666,175.82/23,090.29
6. Step 6: Final answer
   x = 17,222.23