Finding the Fourth Proportional to 42,667.38, 63,998.67 and 13,085.13

Step by Step Solution

1. Step 1: Write the proportion equation
   42,667.38 : 63,998.67 = 13,085.13 : x
2. Step 2: Convert to fraction form
   42,667.38/63,998.67 = 13,085.13/x
3. Step 3: Cross multiply
   42,667.38x = 63,998.67 × 13,085.13
4. Step 4: Simplify right side
   42,667.38x = 837,430,851.35
5. Step 5: Solve for x
   x = 837,430,851.35/42,667.38
6. Step 6: Final answer
   x = 19,626.96