Finding the Third Proportional to 420,925.50 and 638,154

Step by Step Solution

1. Step 1: Write the proportion equation
   420,925.50 : 638,154 = 638,154 : x
2. Step 2: Convert to fraction form
   420,925.50/638,154 = 638,154/x
3. Step 3: Cross multiply
   420,925.50x = 638,154 × 638,154
4. Step 4: Simplify right side
   420,925.50x = 407,240,527,716
5. Step 5: Solve for x
   x = 407,240,527,716/420,925.50
6. Step 6: Final answer
   x = 967,488.37