Finding the Fourth Proportional to 78,564.87, 108,421.50 and 42,756.86

Step by Step Solution

1. Step 1: Write the proportion equation
   78,564.87 : 108,421.50 = 42,756.86 : x
2. Step 2: Convert to fraction form
   78,564.87/108,421.50 = 42,756.86/x
3. Step 3: Cross multiply
   78,564.87x = 108,421.50 × 42,756.86
4. Step 4: Simplify right side
   78,564.87x = 4,635,763,327.88
5. Step 5: Solve for x
   x = 4,635,763,327.88/78,564.87
6. Step 6: Final answer
   x = 59,005.55