Finding the Fourth Proportional to 64,808, 89,473.92 and 42,490.88

Step by Step Solution

1. Step 1: Write the proportion equation
   64,808 : 89,473.92 = 42,490.88 : x
2. Step 2: Convert to fraction form
   64,808/89,473.92 = 42,490.88/x
3. Step 3: Cross multiply
   64,808x = 89,473.92 × 42,490.88
4. Step 4: Simplify right side
   64,808x = 3,801,825,597.85
5. Step 5: Solve for x
   x = 3,801,825,597.85/64,808
6. Step 6: Final answer
   x = 58,662.91