Finding the Fourth Proportional to 2,685.30, 4,026.15 and 1,223.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,685.30 : 4,026.15 = 1,223.70 : x
2. Step 2: Convert to fraction form
   2,685.30/4,026.15 = 1,223.70/x
3. Step 3: Cross multiply
   2,685.30x = 4,026.15 × 1,223.70
4. Step 4: Simplify right side
   2,685.30x = 4,926,799.76
5. Step 5: Solve for x
   x = 4,926,799.76/2,685.30
6. Step 6: Final answer
   x = 1,834.73