Finding the Fourth Proportional to 64,621.40, 89,181.61 and 36,328.91

Step by Step Solution

1. Step 1: Write the proportion equation
   64,621.40 : 89,181.61 = 36,328.91 : x
2. Step 2: Convert to fraction form
   64,621.40/89,181.61 = 36,328.91/x
3. Step 3: Cross multiply
   64,621.40x = 89,181.61 × 36,328.91
4. Step 4: Simplify right side
   64,621.40x = 3,239,870,146.61
5. Step 5: Solve for x
   x = 3,239,870,146.61/64,621.40
6. Step 6: Final answer
   x = 50,136.18