Finding the Fourth Proportional to 21,900.98, 32,879.72 and 18,800.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,900.98 : 32,879.72 = 18,800.91 : x
2. Step 2: Convert to fraction form
   21,900.98/32,879.72 = 18,800.91/x
3. Step 3: Cross multiply
   21,900.98x = 32,879.72 × 18,800.91
4. Step 4: Simplify right side
   21,900.98x = 618,168,703.55
5. Step 5: Solve for x
   x = 618,168,703.55/21,900.98
6. Step 6: Final answer
   x = 28,225.62