Finding the Fourth Proportional to 2,012.62, 2,776.71 and 1,312.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.62 : 2,776.71 = 1,312.78 : x
2. Step 2: Convert to fraction form
   2,012.62/2,776.71 = 1,312.78/x
3. Step 3: Cross multiply
   2,012.62x = 2,776.71 × 1,312.78
4. Step 4: Simplify right side
   2,012.62x = 3,645,209.35
5. Step 5: Solve for x
   x = 3,645,209.35/2,012.62
6. Step 6: Final answer
   x = 1,811.18