Finding the Fourth Proportional to 23,048.55, 31,808.70 and 12,978.09

Step by Step Solution

1. Step 1: Write the proportion equation
   23,048.55 : 31,808.70 = 12,978.09 : x
2. Step 2: Convert to fraction form
   23,048.55/31,808.70 = 12,978.09/x
3. Step 3: Cross multiply
   23,048.55x = 31,808.70 × 12,978.09
4. Step 4: Simplify right side
   23,048.55x = 412,816,171.38
5. Step 5: Solve for x
   x = 412,816,171.38/23,048.55
6. Step 6: Final answer
   x = 17,910.72