Finding the Fourth Proportional to 42,685.31, 64,020.74 and 15,662.09

Step by Step Solution

1. Step 1: Write the proportion equation
   42,685.31 : 64,020.74 = 15,662.09 : x
2. Step 2: Convert to fraction form
   42,685.31/64,020.74 = 15,662.09/x
3. Step 3: Cross multiply
   42,685.31x = 64,020.74 × 15,662.09
4. Step 4: Simplify right side
   42,685.31x = 1,002,698,193.33
5. Step 5: Solve for x
   x = 1,002,698,193.33/42,685.31
6. Step 6: Final answer
   x = 23,490.48