Finding the Fourth Proportional to 105,196.65, 145,172.53 and 57,451.40

Step by Step Solution

1. Step 1: Write the proportion equation
   105,196.65 : 145,172.53 = 57,451.40 : x
2. Step 2: Convert to fraction form
   105,196.65/145,172.53 = 57,451.40/x
3. Step 3: Cross multiply
   105,196.65x = 145,172.53 × 57,451.40
4. Step 4: Simplify right side
   105,196.65x = 8,340,365,090.04
5. Step 5: Solve for x
   x = 8,340,365,090.04/105,196.65
6. Step 6: Final answer
   x = 79,283.56