Finding the Fourth Proportional to 42,682.66, 64,021.56 and 13,100.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,682.66 : 64,021.56 = 13,100.42 : x
2. Step 2: Convert to fraction form
   42,682.66/64,021.56 = 13,100.42/x
3. Step 3: Cross multiply
   42,682.66x = 64,021.56 × 13,100.42
4. Step 4: Simplify right side
   42,682.66x = 838,709,325.06
5. Step 5: Solve for x
   x = 838,709,325.06/42,682.66
6. Step 6: Final answer
   x = 19,649.88