Finding the Fourth Proportional to 78,567.80, 108,421.30 and 42,757

Step by Step Solution

1. Step 1: Write the proportion equation
   78,567.80 : 108,421.30 = 42,757 : x
2. Step 2: Convert to fraction form
   78,567.80/108,421.30 = 42,757/x
3. Step 3: Cross multiply
   78,567.80x = 108,421.30 × 42,757
4. Step 4: Simplify right side
   78,567.80x = 4,635,769,524.10
5. Step 5: Solve for x
   x = 4,635,769,524.10/78,567.80
6. Step 6: Final answer
   x = 59,003.43