Finding the Fourth Proportional to 65,081.79, 89,786.34 and 42,412.50

Step by Step Solution

1. Step 1: Write the proportion equation
   65,081.79 : 89,786.34 = 42,412.50 : x
2. Step 2: Convert to fraction form
   65,081.79/89,786.34 = 42,412.50/x
3. Step 3: Cross multiply
   65,081.79x = 89,786.34 × 42,412.50
4. Step 4: Simplify right side
   65,081.79x = 3,808,063,145.25
5. Step 5: Solve for x
   x = 3,808,063,145.25/65,081.79
6. Step 6: Final answer
   x = 58,511.96