Finding the Third Proportional to 249,930 and 387,106.50

Step by Step Solution

1. Step 1: Write the proportion equation
   249,930 : 387,106.50 = 387,106.50 : x
2. Step 2: Convert to fraction form
   249,930/387,106.50 = 387,106.50/x
3. Step 3: Cross multiply
   249,930x = 387,106.50 × 387,106.50
4. Step 4: Simplify right side
   249,930x = 149,851,442,342.25
5. Step 5: Solve for x
   x = 149,851,442,342.25/249,930
6. Step 6: Final answer
   x = 599,573.65