Finding the Fourth Proportional to 1,185.34, 1,779.63 and 637.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.34 : 1,779.63 = 637.78 : x
2. Step 2: Convert to fraction form
   1,185.34/1,779.63 = 637.78/x
3. Step 3: Cross multiply
   1,185.34x = 1,779.63 × 637.78
4. Step 4: Simplify right side
   1,185.34x = 1,135,012.42
5. Step 5: Solve for x
   x = 1,135,012.42/1,185.34
6. Step 6: Final answer
   x = 957.54