Finding the Third Proportional to 174,139.50 and 379,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   174,139.50 : 379,990.50 = 379,990.50 : x
2. Step 2: Convert to fraction form
   174,139.50/379,990.50 = 379,990.50/x
3. Step 3: Cross multiply
   174,139.50x = 379,990.50 × 379,990.50
4. Step 4: Simplify right side
   174,139.50x = 144,392,780,090.25
5. Step 5: Solve for x
   x = 144,392,780,090.25/174,139.50
6. Step 6: Final answer
   x = 829,178.79