Finding the Fourth Proportional to 1,012.50, 1,519.56 and 869.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.50 : 1,519.56 = 869.94 : x
2. Step 2: Convert to fraction form
   1,012.50/1,519.56 = 869.94/x
3. Step 3: Cross multiply
   1,012.50x = 1,519.56 × 869.94
4. Step 4: Simplify right side
   1,012.50x = 1,321,926.03
5. Step 5: Solve for x
   x = 1,321,926.03/1,012.50
6. Step 6: Final answer
   x = 1,305.61