Finding the Third Proportional to 177,898.50 and 390,789

Step by Step Solution

1. Step 1: Write the proportion equation
   177,898.50 : 390,789 = 390,789 : x
2. Step 2: Convert to fraction form
   177,898.50/390,789 = 390,789/x
3. Step 3: Cross multiply
   177,898.50x = 390,789 × 390,789
4. Step 4: Simplify right side
   177,898.50x = 152,716,042,521
5. Step 5: Solve for x
   x = 152,716,042,521/177,898.50
6. Step 6: Final answer
   x = 858,444.80