Finding the Fourth Proportional to 42,668.38, 64,000.16 and 13,086.13

Step by Step Solution

1. Step 1: Write the proportion equation
   42,668.38 : 64,000.16 = 13,086.13 : x
2. Step 2: Convert to fraction form
   42,668.38/64,000.16 = 13,086.13/x
3. Step 3: Cross multiply
   42,668.38x = 64,000.16 × 13,086.13
4. Step 4: Simplify right side
   42,668.38x = 837,514,413.78
5. Step 5: Solve for x
   x = 837,514,413.78/42,668.38
6. Step 6: Final answer
   x = 19,628.46