Finding the Fourth Proportional to 89,012.91, 122,971.32 and 58,458.50

Step by Step Solution

1. Step 1: Write the proportion equation
   89,012.91 : 122,971.32 = 58,458.50 : x
2. Step 2: Convert to fraction form
   89,012.91/122,971.32 = 58,458.50/x
3. Step 3: Cross multiply
   89,012.91x = 122,971.32 × 58,458.50
4. Step 4: Simplify right side
   89,012.91x = 7,188,718,295.36
5. Step 5: Solve for x
   x = 7,188,718,295.36/89,012.91
6. Step 6: Final answer
   x = 80,760.40