Finding the Third Proportional to 49,387.50 and 78,456

Step by Step Solution

1. Step 1: Write the proportion equation
   49,387.50 : 78,456 = 78,456 : x
2. Step 2: Convert to fraction form
   49,387.50/78,456 = 78,456/x
3. Step 3: Cross multiply
   49,387.50x = 78,456 × 78,456
4. Step 4: Simplify right side
   49,387.50x = 6,155,343,936
5. Step 5: Solve for x
   x = 6,155,343,936/49,387.50
6. Step 6: Final answer
   x = 124,633.64