Finding the Fourth Proportional to 16,557.21, 22,810.61 and 13,555.76

Step by Step Solution

1. Step 1: Write the proportion equation
   16,557.21 : 22,810.61 = 13,555.76 : x
2. Step 2: Convert to fraction form
   16,557.21/22,810.61 = 13,555.76/x
3. Step 3: Cross multiply
   16,557.21x = 22,810.61 × 13,555.76
4. Step 4: Simplify right side
   16,557.21x = 309,215,074.45
5. Step 5: Solve for x
   x = 309,215,074.45/16,557.21
6. Step 6: Final answer
   x = 18,675.55