Finding the Fourth Proportional to 1,779.43, 2,666.82 and 1,287.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,779.43 : 2,666.82 = 1,287.50 : x
2. Step 2: Convert to fraction form
   1,779.43/2,666.82 = 1,287.50/x
3. Step 3: Cross multiply
   1,779.43x = 2,666.82 × 1,287.50
4. Step 4: Simplify right side
   1,779.43x = 3,433,522.24
5. Step 5: Solve for x
   x = 3,433,522.24/1,779.43
6. Step 6: Final answer
   x = 1,929.56