Finding the Fourth Proportional to 105,460.98, 145,536.12 and 57,714.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,460.98 : 145,536.12 = 57,714.30 : x
2. Step 2: Convert to fraction form
   105,460.98/145,536.12 = 57,714.30/x
3. Step 3: Cross multiply
   105,460.98x = 145,536.12 × 57,714.30
4. Step 4: Simplify right side
   105,460.98x = 8,399,515,290.52
5. Step 5: Solve for x
   x = 8,399,515,290.52/105,460.98
6. Step 6: Final answer
   x = 79,645.72