Finding the Fourth Proportional to 23,047.67, 31,808.82 and 12,978.08

Step by Step Solution

1. Step 1: Write the proportion equation
   23,047.67 : 31,808.82 = 12,978.08 : x
2. Step 2: Convert to fraction form
   23,047.67/31,808.82 = 12,978.08/x
3. Step 3: Cross multiply
   23,047.67x = 31,808.82 × 12,978.08
4. Step 4: Simplify right side
   23,047.67x = 412,817,251.62
5. Step 5: Solve for x
   x = 412,817,251.62/23,047.67
6. Step 6: Final answer
   x = 17,911.46