Finding the Fourth Proportional to 78,567.30, 108,420.61 and 42,756.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,567.30 : 108,420.61 = 42,756.50 : x
2. Step 2: Convert to fraction form
   78,567.30/108,420.61 = 42,756.50/x
3. Step 3: Cross multiply
   78,567.30x = 108,420.61 × 42,756.50
4. Step 4: Simplify right side
   78,567.30x = 4,635,685,811.47
5. Step 5: Solve for x
   x = 4,635,685,811.47/78,567.30
6. Step 6: Final answer
   x = 59,002.74