Finding the Fourth Proportional to 105,598.50, 145,725.05 and 57,199.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,598.50 : 145,725.05 = 57,199.31 : x
2. Step 2: Convert to fraction form
   105,598.50/145,725.05 = 57,199.31/x
3. Step 3: Cross multiply
   105,598.50x = 145,725.05 × 57,199.31
4. Step 4: Simplify right side
   105,598.50x = 8,335,372,929.39
5. Step 5: Solve for x
   x = 8,335,372,929.39/105,598.50
6. Step 6: Final answer
   x = 78,934.58