Finding the Fourth Proportional to 72,693.60, 108,975.78 and 28,310.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72,693.60 : 108,975.78 = 28,310.10 : x
2. Step 2: Convert to fraction form
   72,693.60/108,975.78 = 28,310.10/x
3. Step 3: Cross multiply
   72,693.60x = 108,975.78 × 28,310.10
4. Step 4: Simplify right side
   72,693.60x = 3,085,115,229.38
5. Step 5: Solve for x
   x = 3,085,115,229.38/72,693.60
6. Step 6: Final answer
   x = 42,439.98