Finding the Fourth Proportional to 42,849.63, 64,316.01 and 20,678.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,849.63 : 64,316.01 = 20,678.61 : x
2. Step 2: Convert to fraction form
   42,849.63/64,316.01 = 20,678.61/x
3. Step 3: Cross multiply
   42,849.63x = 64,316.01 × 20,678.61
4. Step 4: Simplify right side
   42,849.63x = 1,329,965,687.55
5. Step 5: Solve for x
   x = 1,329,965,687.55/42,849.63
6. Step 6: Final answer
   x = 31,037.97