Finding the Fourth Proportional to 257,196.48, 385,653.78 and 79,654.20

Step by Step Solution

1. Step 1: Write the proportion equation
   257,196.48 : 385,653.78 = 79,654.20 : x
2. Step 2: Convert to fraction form
   257,196.48/385,653.78 = 79,654.20/x
3. Step 3: Cross multiply
   257,196.48x = 385,653.78 × 79,654.20
4. Step 4: Simplify right side
   257,196.48x = 30,718,943,322.88
5. Step 5: Solve for x
   x = 30,718,943,322.88/257,196.48
6. Step 6: Final answer
   x = 119,437.65