Finding the Fourth Proportional to 105,219.06, 145,198.06 and 57,474.10

Step by Step Solution

1. Step 1: Write the proportion equation
   105,219.06 : 145,198.06 = 57,474.10 : x
2. Step 2: Convert to fraction form
   105,219.06/145,198.06 = 57,474.10/x
3. Step 3: Cross multiply
   105,219.06x = 145,198.06 × 57,474.10
4. Step 4: Simplify right side
   105,219.06x = 8,345,127,820.25
5. Step 5: Solve for x
   x = 8,345,127,820.25/105,219.06
6. Step 6: Final answer
   x = 79,311.94