Finding the Fourth Proportional to 42,685.55, 64,037.83 and 13,106.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42,685.55 : 64,037.83 = 13,106.37 : x
2. Step 2: Convert to fraction form
   42,685.55/64,037.83 = 13,106.37/x
3. Step 3: Cross multiply
   42,685.55x = 64,037.83 × 13,106.37
4. Step 4: Simplify right side
   42,685.55x = 839,303,493.98
5. Step 5: Solve for x
   x = 839,303,493.98/42,685.55
6. Step 6: Final answer
   x = 19,662.48