Finding the Third Proportional to 379,413 and 571,621.50

Step by Step Solution

1. Step 1: Write the proportion equation
   379,413 : 571,621.50 = 571,621.50 : x
2. Step 2: Convert to fraction form
   379,413/571,621.50 = 571,621.50/x
3. Step 3: Cross multiply
   379,413x = 571,621.50 × 571,621.50
4. Step 4: Simplify right side
   379,413x = 326,751,139,262.25
5. Step 5: Solve for x
   x = 326,751,139,262.25/379,413
6. Step 6: Final answer
   x = 861,201.75