Finding the Fourth Proportional to 1,075.56, 1,614.15 and 861.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,075.56 : 1,614.15 = 861.72 : x
2. Step 2: Convert to fraction form
   1,075.56/1,614.15 = 861.72/x
3. Step 3: Cross multiply
   1,075.56x = 1,614.15 × 861.72
4. Step 4: Simplify right side
   1,075.56x = 1,390,945.34
5. Step 5: Solve for x
   x = 1,390,945.34/1,075.56
6. Step 6: Final answer
   x = 1,293.23