Finding the Fourth Proportional to 78,563.94, 108,420.50 and 42,756.21

Step by Step Solution

1. Step 1: Write the proportion equation
   78,563.94 : 108,420.50 = 42,756.21 : x
2. Step 2: Convert to fraction form
   78,563.94/108,420.50 = 42,756.21/x
3. Step 3: Cross multiply
   78,563.94x = 108,420.50 × 42,756.21
4. Step 4: Simplify right side
   78,563.94x = 4,635,649,452.52
5. Step 5: Solve for x
   x = 4,635,649,452.52/78,563.94
6. Step 6: Final answer
   x = 59,004.80