Finding the Fourth Proportional to 105,443.57, 145,514.48 and 57,696.90

Step by Step Solution

1. Step 1: Write the proportion equation
   105,443.57 : 145,514.48 = 57,696.90 : x
2. Step 2: Convert to fraction form
   105,443.57/145,514.48 = 57,696.90/x
3. Step 3: Cross multiply
   105,443.57x = 145,514.48 × 57,696.90
4. Step 4: Simplify right side
   105,443.57x = 8,395,734,112.63
5. Step 5: Solve for x
   x = 8,395,734,112.63/105,443.57
6. Step 6: Final answer
   x = 79,623.01