Finding the Fourth Proportional to 810,638.60, 1,118,685.72 and 443,116.29

Step by Step Solution

1. Step 1: Write the proportion equation
   810,638.60 : 1,118,685.72 = 443,116.29 : x
2. Step 2: Convert to fraction form
   810,638.60/1,118,685.72 = 443,116.29/x
3. Step 3: Cross multiply
   810,638.60x = 1,118,685.72 × 443,116.29
4. Step 4: Simplify right side
   810,638.60x = 495,707,865,922.38
5. Step 5: Solve for x
   x = 495,707,865,922.38/810,638.60
6. Step 6: Final answer
   x = 611,502.92