Finding the Third Proportional to 78,421.50 and 118,368

Step by Step Solution

1. Step 1: Write the proportion equation
   78,421.50 : 118,368 = 118,368 : x
2. Step 2: Convert to fraction form
   78,421.50/118,368 = 118,368/x
3. Step 3: Cross multiply
   78,421.50x = 118,368 × 118,368
4. Step 4: Simplify right side
   78,421.50x = 14,010,983,424
5. Step 5: Solve for x
   x = 14,010,983,424/78,421.50
6. Step 6: Final answer
   x = 178,662.53