Finding the Fourth Proportional to 42,779.86, 64,180.72 and 17,811.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,779.86 : 64,180.72 = 17,811.61 : x
2. Step 2: Convert to fraction form
   42,779.86/64,180.72 = 17,811.61/x
3. Step 3: Cross multiply
   42,779.86x = 64,180.72 × 17,811.61
4. Step 4: Simplify right side
   42,779.86x = 1,143,161,749.18
5. Step 5: Solve for x
   x = 1,143,161,749.18/42,779.86
6. Step 6: Final answer
   x = 26,721.96