Finding the Third Proportional to 177,568.50 and 390,129

Step by Step Solution

1. Step 1: Write the proportion equation
   177,568.50 : 390,129 = 390,129 : x
2. Step 2: Convert to fraction form
   177,568.50/390,129 = 390,129/x
3. Step 3: Cross multiply
   177,568.50x = 390,129 × 390,129
4. Step 4: Simplify right side
   177,568.50x = 152,200,636,641
5. Step 5: Solve for x
   x = 152,200,636,641/177,568.50
6. Step 6: Final answer
   x = 857,137.59