Finding the Fourth Proportional to 48,683.12, 72,672.50 and 42,778.20

Step by Step Solution

1. Step 1: Write the proportion equation
   48,683.12 : 72,672.50 = 42,778.20 : x
2. Step 2: Convert to fraction form
   48,683.12/72,672.50 = 42,778.20/x
3. Step 3: Cross multiply
   48,683.12x = 72,672.50 × 42,778.20
4. Step 4: Simplify right side
   48,683.12x = 3,108,798,739.50
5. Step 5: Solve for x
   x = 3,108,798,739.50/48,683.12
6. Step 6: Final answer
   x = 63,857.84