Finding the Third Proportional to 249,430 and 380,372.50

Step by Step Solution

1. Step 1: Write the proportion equation
   249,430 : 380,372.50 = 380,372.50 : x
2. Step 2: Convert to fraction form
   249,430/380,372.50 = 380,372.50/x
3. Step 3: Cross multiply
   249,430x = 380,372.50 × 380,372.50
4. Step 4: Simplify right side
   249,430x = 144,683,238,756.25
5. Step 5: Solve for x
   x = 144,683,238,756.25/249,430
6. Step 6: Final answer
   x = 580,055.48