Finding the Fourth Proportional to 89,992.82, 135,028.65 and 42,641.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89,992.82 : 135,028.65 = 42,641.72 : x
2. Step 2: Convert to fraction form
   89,992.82/135,028.65 = 42,641.72/x
3. Step 3: Cross multiply
   89,992.82x = 135,028.65 × 42,641.72
4. Step 4: Simplify right side
   89,992.82x = 5,757,853,136.84
5. Step 5: Solve for x
   x = 5,757,853,136.84/89,992.82
6. Step 6: Final answer
   x = 63,981.25