Finding the Fourth Proportional to 621,196.50, 931,815.42 and 171,879.72

Step by Step Solution

1. Step 1: Write the proportion equation
   621,196.50 : 931,815.42 = 171,879.72 : x
2. Step 2: Convert to fraction form
   621,196.50/931,815.42 = 171,879.72/x
3. Step 3: Cross multiply
   621,196.50x = 931,815.42 × 171,879.72
4. Step 4: Simplify right side
   621,196.50x = 160,160,173,481.28
5. Step 5: Solve for x
   x = 160,160,173,481.28/621,196.50
6. Step 6: Final answer
   x = 257,825.30