Finding the Fourth Proportional to 64,796, 89,457.36 and 42,478.88

Step by Step Solution

1. Step 1: Write the proportion equation
   64,796 : 89,457.36 = 42,478.88 : x
2. Step 2: Convert to fraction form
   64,796/89,457.36 = 42,478.88/x
3. Step 3: Cross multiply
   64,796x = 89,457.36 × 42,478.88
4. Step 4: Simplify right side
   64,796x = 3,800,048,460.56
5. Step 5: Solve for x
   x = 3,800,048,460.56/64,796
6. Step 6: Final answer
   x = 58,646.34