Finding the Fourth Proportional to 42,456.65, 63,684.74 and 10,866.65

Step by Step Solution

1. Step 1: Write the proportion equation
   42,456.65 : 63,684.74 = 10,866.65 : x
2. Step 2: Convert to fraction form
   42,456.65/63,684.74 = 10,866.65/x
3. Step 3: Cross multiply
   42,456.65x = 63,684.74 × 10,866.65
4. Step 4: Simplify right side
   42,456.65x = 692,039,488.66
5. Step 5: Solve for x
   x = 692,039,488.66/42,456.65
6. Step 6: Final answer
   x = 16,299.91