Finding the Fourth Proportional to 42,779.98, 64,180.90 and 17,811.73

Step by Step Solution

1. Step 1: Write the proportion equation
   42,779.98 : 64,180.90 = 17,811.73 : x
2. Step 2: Convert to fraction form
   42,779.98/64,180.90 = 17,811.73/x
3. Step 3: Cross multiply
   42,779.98x = 64,180.90 × 17,811.73
4. Step 4: Simplify right side
   42,779.98x = 1,143,172,861.96
5. Step 5: Solve for x
   x = 1,143,172,861.96/42,779.98
6. Step 6: Final answer
   x = 26,722.15