Finding the Third Proportional to 249,120 and 386,806.50

Step by Step Solution

1. Step 1: Write the proportion equation
   249,120 : 386,806.50 = 386,806.50 : x
2. Step 2: Convert to fraction form
   249,120/386,806.50 = 386,806.50/x
3. Step 3: Cross multiply
   249,120x = 386,806.50 × 386,806.50
4. Step 4: Simplify right side
   249,120x = 149,619,268,442.25
5. Step 5: Solve for x
   x = 149,619,268,442.25/249,120
6. Step 6: Final answer
   x = 600,591.15