Finding the Fourth Proportional to 72,631.60, 108,986.10 and 28,259.80

Step by Step Solution

1. Step 1: Write the proportion equation
   72,631.60 : 108,986.10 = 28,259.80 : x
2. Step 2: Convert to fraction form
   72,631.60/108,986.10 = 28,259.80/x
3. Step 3: Cross multiply
   72,631.60x = 108,986.10 × 28,259.80
4. Step 4: Simplify right side
   72,631.60x = 3,079,925,388.78
5. Step 5: Solve for x
   x = 3,079,925,388.78/72,631.60
6. Step 6: Final answer
   x = 42,404.76