Finding the Third Proportional to 118,390.50 and 178,810.50

Step by Step Solution

1. Step 1: Write the proportion equation
   118,390.50 : 178,810.50 = 178,810.50 : x
2. Step 2: Convert to fraction form
   118,390.50/178,810.50 = 178,810.50/x
3. Step 3: Cross multiply
   118,390.50x = 178,810.50 × 178,810.50
4. Step 4: Simplify right side
   118,390.50x = 31,973,194,910.25
5. Step 5: Solve for x
   x = 31,973,194,910.25/118,390.50
6. Step 6: Final answer
   x = 270,065.55