Finding the Fourth Proportional to 42,866.21, 64,275.82 and 13,275.83

Step by Step Solution

1. Step 1: Write the proportion equation
   42,866.21 : 64,275.82 = 13,275.83 : x
2. Step 2: Convert to fraction form
   42,866.21/64,275.82 = 13,275.83/x
3. Step 3: Cross multiply
   42,866.21x = 64,275.82 × 13,275.83
4. Step 4: Simplify right side
   42,866.21x = 853,314,504.86
5. Step 5: Solve for x
   x = 853,314,504.86/42,866.21
6. Step 6: Final answer
   x = 19,906.46