Finding the Third Proportional to 243,175.61 and 388,478.69

Step by Step Solution

1. Step 1: Write the proportion equation
   243,175.61 : 388,478.69 = 388,478.69 : x
2. Step 2: Convert to fraction form
   243,175.61/388,478.69 = 388,478.69/x
3. Step 3: Cross multiply
   243,175.61x = 388,478.69 × 388,478.69
4. Step 4: Simplify right side
   243,175.61x = 150,915,692,159.21
5. Step 5: Solve for x
   x = 150,915,692,159.21/243,175.61
6. Step 6: Final answer
   x = 620,603.75