Finding the Third Proportional to 387,190 and 586,621.50

Step by Step Solution

1. Step 1: Write the proportion equation
   387,190 : 586,621.50 = 586,621.50 : x
2. Step 2: Convert to fraction form
   387,190/586,621.50 = 586,621.50/x
3. Step 3: Cross multiply
   387,190x = 586,621.50 × 586,621.50
4. Step 4: Simplify right side
   387,190x = 344,124,784,262.25
5. Step 5: Solve for x
   x = 344,124,784,262.25/387,190
6. Step 6: Final answer
   x = 888,774.98