Finding the Fourth Proportional to 23,225.18, 34,782.42 and 12,679.40

Step by Step Solution

1. Step 1: Write the proportion equation
   23,225.18 : 34,782.42 = 12,679.40 : x
2. Step 2: Convert to fraction form
   23,225.18/34,782.42 = 12,679.40/x
3. Step 3: Cross multiply
   23,225.18x = 34,782.42 × 12,679.40
4. Step 4: Simplify right side
   23,225.18x = 441,020,216.15
5. Step 5: Solve for x
   x = 441,020,216.15/23,225.18
6. Step 6: Final answer
   x = 18,988.88