Finding the Fourth Proportional to 1,771.05, 2,666.87 and 1,312.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,771.05 : 2,666.87 = 1,312.09 : x
2. Step 2: Convert to fraction form
   1,771.05/2,666.87 = 1,312.09/x
3. Step 3: Cross multiply
   1,771.05x = 2,666.87 × 1,312.09
4. Step 4: Simplify right side
   1,771.05x = 3,499,165.15
5. Step 5: Solve for x
   x = 3,499,165.15/1,771.05
6. Step 6: Final answer
   x = 1,975.75