Finding the Fourth Proportional to 345,275.89, 476,504.69 and 209,315.57

Step by Step Solution

1. Step 1: Write the proportion equation
   345,275.89 : 476,504.69 = 209,315.57 : x
2. Step 2: Convert to fraction form
   345,275.89/476,504.69 = 209,315.57/x
3. Step 3: Cross multiply
   345,275.89x = 476,504.69 × 209,315.57
4. Step 4: Simplify right side
   345,275.89x = 99,739,849,748.45
5. Step 5: Solve for x
   x = 99,739,849,748.45/345,275.89
6. Step 6: Final answer
   x = 288,870.01