Finding the Fourth Proportional to 105,404.58, 145,456.43 and 57,657.51

Step by Step Solution

1. Step 1: Write the proportion equation
   105,404.58 : 145,456.43 = 57,657.51 : x
2. Step 2: Convert to fraction form
   105,404.58/145,456.43 = 57,657.51/x
3. Step 3: Cross multiply
   105,404.58x = 145,456.43 × 57,657.51
4. Step 4: Simplify right side
   105,404.58x = 8,386,655,279.00
5. Step 5: Solve for x
   x = 8,386,655,279.00/105,404.58
6. Step 6: Final answer
   x = 79,566.33