Finding the Fourth Proportional to 644,667.20, 965,671.89 and 377,618.10

Step by Step Solution

1. Step 1: Write the proportion equation
   644,667.20 : 965,671.89 = 377,618.10 : x
2. Step 2: Convert to fraction form
   644,667.20/965,671.89 = 377,618.10/x
3. Step 3: Cross multiply
   644,667.20x = 965,671.89 × 377,618.10
4. Step 4: Simplify right side
   644,667.20x = 364,655,184,325.21
5. Step 5: Solve for x
   x = 364,655,184,325.21/644,667.20
6. Step 6: Final answer
   x = 565,648.73