Finding the Third Proportional to 168,819.40 and 257,516.72

Step by Step Solution

1. Step 1: Write the proportion equation
   168,819.40 : 257,516.72 = 257,516.72 : x
2. Step 2: Convert to fraction form
   168,819.40/257,516.72 = 257,516.72/x
3. Step 3: Cross multiply
   168,819.40x = 257,516.72 × 257,516.72
4. Step 4: Simplify right side
   168,819.40x = 66,314,860,435.77
5. Step 5: Solve for x
   x = 66,314,860,435.77/168,819.40
6. Step 6: Final answer
   x = 392,815.41