Finding the Fourth Proportional to 64,797, 89,458.74 and 42,479.88

Step by Step Solution

1. Step 1: Write the proportion equation
   64,797 : 89,458.74 = 42,479.88 : x
2. Step 2: Convert to fraction form
   64,797/89,458.74 = 42,479.88/x
3. Step 3: Cross multiply
   64,797x = 89,458.74 × 42,479.88
4. Step 4: Simplify right side
   64,797x = 3,800,196,540.15
5. Step 5: Solve for x
   x = 3,800,196,540.15/64,797
6. Step 6: Final answer
   x = 58,647.72