Finding the Fourth Proportional to 105,204.68, 145,181.72 and 57,458.04

Step by Step Solution

1. Step 1: Write the proportion equation
   105,204.68 : 145,181.72 = 57,458.04 : x
2. Step 2: Convert to fraction form
   105,204.68/145,181.72 = 57,458.04/x
3. Step 3: Cross multiply
   105,204.68x = 145,181.72 × 57,458.04
4. Step 4: Simplify right side
   105,204.68x = 8,341,857,075.03
5. Step 5: Solve for x
   x = 8,341,857,075.03/105,204.68
6. Step 6: Final answer
   x = 79,291.69