Finding the Fourth Proportional to 65,005.79, 89,621.25 and 51,621.35

Step by Step Solution

1. Step 1: Write the proportion equation
   65,005.79 : 89,621.25 = 51,621.35 : x
2. Step 2: Convert to fraction form
   65,005.79/89,621.25 = 51,621.35/x
3. Step 3: Cross multiply
   65,005.79x = 89,621.25 × 51,621.35
4. Step 4: Simplify right side
   65,005.79x = 4,626,369,913.69
5. Step 5: Solve for x
   x = 4,626,369,913.69/65,005.79
6. Step 6: Final answer
   x = 71,168.58