Finding the Fourth Proportional to 105,488.18, 145,568.05 and 57,732.29

Step by Step Solution

1. Step 1: Write the proportion equation
   105,488.18 : 145,568.05 = 57,732.29 : x
2. Step 2: Convert to fraction form
   105,488.18/145,568.05 = 57,732.29/x
3. Step 3: Cross multiply
   105,488.18x = 145,568.05 × 57,732.29
4. Step 4: Simplify right side
   105,488.18x = 8,403,976,005.16
5. Step 5: Solve for x
   x = 8,403,976,005.16/105,488.18
6. Step 6: Final answer
   x = 79,667.47