Finding the Fourth Proportional to 65,879.39, 91,066.78 and 58,779.67

Step by Step Solution

1. Step 1: Write the proportion equation
   65,879.39 : 91,066.78 = 58,779.67 : x
2. Step 2: Convert to fraction form
   65,879.39/91,066.78 = 58,779.67/x
3. Step 3: Cross multiply
   65,879.39x = 91,066.78 × 58,779.67
4. Step 4: Simplify right side
   65,879.39x = 5,352,874,962.28
5. Step 5: Solve for x
   x = 5,352,874,962.28/65,879.39
6. Step 6: Final answer
   x = 81,252.65