Finding the Fourth Proportional to 257,185.11, 385,636.72 and 79,642.83

Step by Step Solution

1. Step 1: Write the proportion equation
   257,185.11 : 385,636.72 = 79,642.83 : x
2. Step 2: Convert to fraction form
   257,185.11/385,636.72 = 79,642.83/x
3. Step 3: Cross multiply
   257,185.11x = 385,636.72 × 79,642.83
4. Step 4: Simplify right side
   257,185.11x = 30,713,197,605.43
5. Step 5: Solve for x
   x = 30,713,197,605.43/257,185.11
6. Step 6: Final answer
   x = 119,420.59