Finding the Fourth Proportional to 78,612, 108,487.80 and 45,078

Step by Step Solution

1. Step 1: Write the proportion equation
   78,612 : 108,487.80 = 45,078 : x
2. Step 2: Convert to fraction form
   78,612/108,487.80 = 45,078/x
3. Step 3: Cross multiply
   78,612x = 108,487.80 × 45,078
4. Step 4: Simplify right side
   78,612x = 4,890,413,048.40
5. Step 5: Solve for x
   x = 4,890,413,048.40/78,612
6. Step 6: Final answer
   x = 62,209.50