Finding the Fourth Proportional to 105,321.09, 145,343.18 and 57,574.46

Step by Step Solution

1. Step 1: Write the proportion equation
   105,321.09 : 145,343.18 = 57,574.46 : x
2. Step 2: Convert to fraction form
   105,321.09/145,343.18 = 57,574.46/x
3. Step 3: Cross multiply
   105,321.09x = 145,343.18 × 57,574.46
4. Step 4: Simplify right side
   105,321.09x = 8,368,054,088.59
5. Step 5: Solve for x
   x = 8,368,054,088.59/105,321.09
6. Step 6: Final answer
   x = 79,452.79