Finding the Fourth Proportional to 64,764, 89,413.20 and 42,446.88

Step by Step Solution

1. Step 1: Write the proportion equation
   64,764 : 89,413.20 = 42,446.88 : x
2. Step 2: Convert to fraction form
   64,764/89,413.20 = 42,446.88/x
3. Step 3: Cross multiply
   64,764x = 89,413.20 × 42,446.88
4. Step 4: Simplify right side
   64,764x = 3,795,311,370.82
5. Step 5: Solve for x
   x = 3,795,311,370.82/64,764
6. Step 6: Final answer
   x = 58,602.18