Finding the Fourth Proportional to 48,648.78, 72,971.82 and 13,587.48

Step by Step Solution

1. Step 1: Write the proportion equation
   48,648.78 : 72,971.82 = 13,587.48 : x
2. Step 2: Convert to fraction form
   48,648.78/72,971.82 = 13,587.48/x
3. Step 3: Cross multiply
   48,648.78x = 72,971.82 × 13,587.48
4. Step 4: Simplify right side
   48,648.78x = 991,503,144.81
5. Step 5: Solve for x
   x = 991,503,144.81/48,648.78
6. Step 6: Final answer
   x = 20,380.84