Finding the Fourth Proportional to 389,603.42, 584,402.06 and 209,773.10

Step by Step Solution

1. Step 1: Write the proportion equation
   389,603.42 : 584,402.06 = 209,773.10 : x
2. Step 2: Convert to fraction form
   389,603.42/584,402.06 = 209,773.10/x
3. Step 3: Cross multiply
   389,603.42x = 584,402.06 × 209,773.10
4. Step 4: Simplify right side
   389,603.42x = 122,591,831,772.59
5. Step 5: Solve for x
   x = 122,591,831,772.59/389,603.42
6. Step 6: Final answer
   x = 314,658.00