Finding the Third Proportional to 178,938 and 390,030.75

Step by Step Solution

1. Step 1: Write the proportion equation
   178,938 : 390,030.75 = 390,030.75 : x
2. Step 2: Convert to fraction form
   178,938/390,030.75 = 390,030.75/x
3. Step 3: Cross multiply
   178,938x = 390,030.75 × 390,030.75
4. Step 4: Simplify right side
   178,938x = 152,123,985,945.56
5. Step 5: Solve for x
   x = 152,123,985,945.56/178,938
6. Step 6: Final answer
   x = 850,149.14