Finding the Fourth Proportional to 72,212.80, 108,383.20 and 42,593.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,212.80 : 108,383.20 = 42,593.60 : x
2. Step 2: Convert to fraction form
   72,212.80/108,383.20 = 42,593.60/x
3. Step 3: Cross multiply
   72,212.80x = 108,383.20 × 42,593.60
4. Step 4: Simplify right side
   72,212.80x = 4,616,430,667.52
5. Step 5: Solve for x
   x = 4,616,430,667.52/72,212.80
6. Step 6: Final answer
   x = 63,928.15