Finding the Fourth Proportional to 2,690.79, 4,012.14 and 2,685.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,690.79 : 4,012.14 = 2,685.53 : x
2. Step 2: Convert to fraction form
   2,690.79/4,012.14 = 2,685.53/x
3. Step 3: Cross multiply
   2,690.79x = 4,012.14 × 2,685.53
4. Step 4: Simplify right side
   2,690.79x = 10,774,702.27
5. Step 5: Solve for x
   x = 10,774,702.27/2,690.79
6. Step 6: Final answer
   x = 4,004.29