Finding the Fourth Proportional to 105,716, 145,892.50 and 57,971.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,716 : 145,892.50 = 57,971.18 : x
2. Step 2: Convert to fraction form
   105,716/145,892.50 = 57,971.18/x
3. Step 3: Cross multiply
   105,716x = 145,892.50 × 57,971.18
4. Step 4: Simplify right side
   105,716x = 8,457,560,378.15
5. Step 5: Solve for x
   x = 8,457,560,378.15/105,716
6. Step 6: Final answer
   x = 80,002.65