Finding the Fourth Proportional to 21,546.48, 29,724.72 and 13,158

Step by Step Solution

1. Step 1: Write the proportion equation
   21,546.48 : 29,724.72 = 13,158 : x
2. Step 2: Convert to fraction form
   21,546.48/29,724.72 = 13,158/x
3. Step 3: Cross multiply
   21,546.48x = 29,724.72 × 13,158
4. Step 4: Simplify right side
   21,546.48x = 391,117,865.76
5. Step 5: Solve for x
   x = 391,117,865.76/21,546.48
6. Step 6: Final answer
   x = 18,152.29