Finding the Fourth Proportional to 42,723.55, 64,085.47 and 13,141.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42,723.55 : 64,085.47 = 13,141.18 : x
2. Step 2: Convert to fraction form
   42,723.55/64,085.47 = 13,141.18/x
3. Step 3: Cross multiply
   42,723.55x = 64,085.47 × 13,141.18
4. Step 4: Simplify right side
   42,723.55x = 842,158,696.65
5. Step 5: Solve for x
   x = 842,158,696.65/42,723.55
6. Step 6: Final answer
   x = 19,711.82