Finding the Fourth Proportional to 65,978.16, 91,004.76 and 40,783.92

Step by Step Solution

1. Step 1: Write the proportion equation
   65,978.16 : 91,004.76 = 40,783.92 : x
2. Step 2: Convert to fraction form
   65,978.16/91,004.76 = 40,783.92/x
3. Step 3: Cross multiply
   65,978.16x = 91,004.76 × 40,783.92
4. Step 4: Simplify right side
   65,978.16x = 3,711,530,851.46
5. Step 5: Solve for x
   x = 3,711,530,851.46/65,978.16
6. Step 6: Final answer
   x = 56,253.93