Finding the Fourth Proportional to 64,556.64, 89,082.72 and 39,401.28

Step by Step Solution

1. Step 1: Write the proportion equation
   64,556.64 : 89,082.72 = 39,401.28 : x
2. Step 2: Convert to fraction form
   64,556.64/89,082.72 = 39,401.28/x
3. Step 3: Cross multiply
   64,556.64x = 89,082.72 × 39,401.28
4. Step 4: Simplify right side
   64,556.64x = 3,509,973,193.88
5. Step 5: Solve for x
   x = 3,509,973,193.88/64,556.64
6. Step 6: Final answer
   x = 54,370.44