Finding the Fourth Proportional to 42,786.45, 64,186.52 and 13,197.33

Step by Step Solution

1. Step 1: Write the proportion equation
   42,786.45 : 64,186.52 = 13,197.33 : x
2. Step 2: Convert to fraction form
   42,786.45/64,186.52 = 13,197.33/x
3. Step 3: Cross multiply
   42,786.45x = 64,186.52 × 13,197.33
4. Step 4: Simplify right side
   42,786.45x = 847,090,620.00
5. Step 5: Solve for x
   x = 847,090,620.00/42,786.45
6. Step 6: Final answer
   x = 19,798.10