Finding the Fourth Proportional to 21,077.48, 31,625.42 and 12,312.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,077.48 : 31,625.42 = 12,312.42 : x
2. Step 2: Convert to fraction form
   21,077.48/31,625.42 = 12,312.42/x
3. Step 3: Cross multiply
   21,077.48x = 31,625.42 × 12,312.42
4. Step 4: Simplify right side
   21,077.48x = 389,385,392.15
5. Step 5: Solve for x
   x = 389,385,392.15/21,077.48
6. Step 6: Final answer
   x = 18,474.01