Finding the Fourth Proportional to 493,676.10, 740,222.55 and 257,480.10

Step by Step Solution

1. Step 1: Write the proportion equation
   493,676.10 : 740,222.55 = 257,480.10 : x
2. Step 2: Convert to fraction form
   493,676.10/740,222.55 = 257,480.10/x
3. Step 3: Cross multiply
   493,676.10x = 740,222.55 × 257,480.10
4. Step 4: Simplify right side
   493,676.10x = 190,592,576,196.26
5. Step 5: Solve for x
   x = 190,592,576,196.26/493,676.10
6. Step 6: Final answer
   x = 386,068.06