Finding the Fourth Proportional to 813,890, 1,123,168.20 and 456,194

Step by Step Solution

1. Step 1: Write the proportion equation
   813,890 : 1,123,168.20 = 456,194 : x
2. Step 2: Convert to fraction form
   813,890/1,123,168.20 = 456,194/x
3. Step 3: Cross multiply
   813,890x = 1,123,168.20 × 456,194
4. Step 4: Simplify right side
   813,890x = 512,382,593,830.80
5. Step 5: Solve for x
   x = 512,382,593,830.80/813,890
6. Step 6: Final answer
   x = 629,547.72