Finding the Fourth Proportional to 65,078.78, 89,782.20 and 42,409.51

Step by Step Solution

1. Step 1: Write the proportion equation
   65,078.78 : 89,782.20 = 42,409.51 : x
2. Step 2: Convert to fraction form
   65,078.78/89,782.20 = 42,409.51/x
3. Step 3: Cross multiply
   65,078.78x = 89,782.20 × 42,409.51
4. Step 4: Simplify right side
   65,078.78x = 3,807,618,884.27
5. Step 5: Solve for x
   x = 3,807,618,884.27/65,078.78
6. Step 6: Final answer
   x = 58,507.85