Finding the Fourth Proportional to 345,288.37, 476,521.89 and 209,328.05

Step by Step Solution

1. Step 1: Write the proportion equation
   345,288.37 : 476,521.89 = 209,328.05 : x
2. Step 2: Convert to fraction form
   345,288.37/476,521.89 = 209,328.05/x
3. Step 3: Cross multiply
   345,288.37x = 476,521.89 × 209,328.05
4. Step 4: Simplify right side
   345,288.37x = 99,749,395,741.90
5. Step 5: Solve for x
   x = 99,749,395,741.90/345,288.37
6. Step 6: Final answer
   x = 288,887.22