Finding the Fourth Proportional to 42,683.54, 64,014.24 and 12,690.74

Step by Step Solution

1. Step 1: Write the proportion equation
   42,683.54 : 64,014.24 = 12,690.74 : x
2. Step 2: Convert to fraction form
   42,683.54/64,014.24 = 12,690.74/x
3. Step 3: Cross multiply
   42,683.54x = 64,014.24 × 12,690.74
4. Step 4: Simplify right side
   42,683.54x = 812,388,076.14
5. Step 5: Solve for x
   x = 812,388,076.14/42,683.54
6. Step 6: Final answer
   x = 19,032.82