Finding the Fourth Proportional to 42,855.59, 64,300.31 and 13,275.73

Step by Step Solution

1. Step 1: Write the proportion equation
   42,855.59 : 64,300.31 = 13,275.73 : x
2. Step 2: Convert to fraction form
   42,855.59/64,300.31 = 13,275.73/x
3. Step 3: Cross multiply
   42,855.59x = 64,300.31 × 13,275.73
4. Step 4: Simplify right side
   42,855.59x = 853,633,580.92
5. Step 5: Solve for x
   x = 853,633,580.92/42,855.59
6. Step 6: Final answer
   x = 19,918.84