Finding the Third Proportional to 78,400.50 and 105,345

Step by Step Solution

1. Step 1: Write the proportion equation
   78,400.50 : 105,345 = 105,345 : x
2. Step 2: Convert to fraction form
   78,400.50/105,345 = 105,345/x
3. Step 3: Cross multiply
   78,400.50x = 105,345 × 105,345
4. Step 4: Simplify right side
   78,400.50x = 11,097,569,025
5. Step 5: Solve for x
   x = 11,097,569,025/78,400.50
6. Step 6: Final answer
   x = 141,549.72