Finding the Fourth Proportional to 105,448.34, 145,518.72 and 57,702.08

Step by Step Solution

1. Step 1: Write the proportion equation
   105,448.34 : 145,518.72 = 57,702.08 : x
2. Step 2: Convert to fraction form
   105,448.34/145,518.72 = 57,702.08/x
3. Step 3: Cross multiply
   105,448.34x = 145,518.72 × 57,702.08
4. Step 4: Simplify right side
   105,448.34x = 8,396,732,822.94
5. Step 5: Solve for x
   x = 8,396,732,822.94/105,448.34
6. Step 6: Final answer
   x = 79,628.88