Finding the Fourth Proportional to 19,801.50, 29,679.21 and 8,100.54

Step by Step Solution

1. Step 1: Write the proportion equation
   19,801.50 : 29,679.21 = 8,100.54 : x
2. Step 2: Convert to fraction form
   19,801.50/29,679.21 = 8,100.54/x
3. Step 3: Cross multiply
   19,801.50x = 29,679.21 × 8,100.54
4. Step 4: Simplify right side
   19,801.50x = 240,417,627.77
5. Step 5: Solve for x
   x = 240,417,627.77/19,801.50
6. Step 6: Final answer
   x = 12,141.38