Finding the Fourth Proportional to 340,300.78, 510,766.24 and 171,939.60

Step by Step Solution

1. Step 1: Write the proportion equation
   340,300.78 : 510,766.24 = 171,939.60 : x
2. Step 2: Convert to fraction form
   340,300.78/510,766.24 = 171,939.60/x
3. Step 3: Cross multiply
   340,300.78x = 510,766.24 × 171,939.60
4. Step 4: Simplify right side
   340,300.78x = 87,820,942,999.10
5. Step 5: Solve for x
   x = 87,820,942,999.10/340,300.78
6. Step 6: Final answer
   x = 258,068.59