Finding the Fourth Proportional to 42,667.88, 63,999.42 and 13,085.63

Step by Step Solution

1. Step 1: Write the proportion equation
   42,667.88 : 63,999.42 = 13,085.63 : x
2. Step 2: Convert to fraction form
   42,667.88/63,999.42 = 13,085.63/x
3. Step 3: Cross multiply
   42,667.88x = 63,999.42 × 13,085.63
4. Step 4: Simplify right side
   42,667.88x = 837,472,664.91
5. Step 5: Solve for x
   x = 837,472,664.91/42,667.88
6. Step 6: Final answer
   x = 19,627.71