Finding the Fourth Proportional to 42,842.86, 64,305.78 and 20,671.82

Step by Step Solution

1. Step 1: Write the proportion equation
   42,842.86 : 64,305.78 = 20,671.82 : x
2. Step 2: Convert to fraction form
   42,842.86/64,305.78 = 20,671.82/x
3. Step 3: Cross multiply
   42,842.86x = 64,305.78 × 20,671.82
4. Step 4: Simplify right side
   42,842.86x = 1,329,317,509.12
5. Step 5: Solve for x
   x = 1,329,317,509.12/42,842.86
6. Step 6: Final answer
   x = 31,027.75