Finding the Fourth Proportional to 65,478.10, 90,273.59 and 42,777.65

Step by Step Solution

1. Step 1: Write the proportion equation
   65,478.10 : 90,273.59 = 42,777.65 : x
2. Step 2: Convert to fraction form
   65,478.10/90,273.59 = 42,777.65/x
3. Step 3: Cross multiply
   65,478.10x = 90,273.59 × 42,777.65
4. Step 4: Simplify right side
   65,478.10x = 3,861,691,585.90
5. Step 5: Solve for x
   x = 3,861,691,585.90/65,478.10
6. Step 6: Final answer
   x = 58,976.84