Finding the Fourth Proportional to 42,786.87, 64,188.86 and 13,203.59

Step by Step Solution

1. Step 1: Write the proportion equation
   42,786.87 : 64,188.86 = 13,203.59 : x
2. Step 2: Convert to fraction form
   42,786.87/64,188.86 = 13,203.59/x
3. Step 3: Cross multiply
   42,786.87x = 64,188.86 × 13,203.59
4. Step 4: Simplify right side
   42,786.87x = 847,523,390.01
5. Step 5: Solve for x
   x = 847,523,390.01/42,786.87
6. Step 6: Final answer
   x = 19,808.02