Finding the Fourth Proportional to 2,075.50, 3,111.72 and 979

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.50 : 3,111.72 = 979 : x
2. Step 2: Convert to fraction form
   2,075.50/3,111.72 = 979/x
3. Step 3: Cross multiply
   2,075.50x = 3,111.72 × 979
4. Step 4: Simplify right side
   2,075.50x = 3,046,373.88
5. Step 5: Solve for x
   x = 3,046,373.88/2,075.50
6. Step 6: Final answer
   x = 1,467.78