Finding the Fourth Proportional to 23,049.60, 31,808.64 and 12,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   23,049.60 : 31,808.64 = 12,978.72 : x
2. Step 2: Convert to fraction form
   23,049.60/31,808.64 = 12,978.72/x
3. Step 3: Cross multiply
   23,049.60x = 31,808.64 × 12,978.72
4. Step 4: Simplify right side
   23,049.60x = 412,835,432.14
5. Step 5: Solve for x
   x = 412,835,432.14/23,049.60
6. Step 6: Final answer
   x = 17,910.74