Finding the Fourth Proportional to 1,012.55, 1,519.76 and 525.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.55 : 1,519.76 = 525.94 : x
2. Step 2: Convert to fraction form
   1,012.55/1,519.76 = 525.94/x
3. Step 3: Cross multiply
   1,012.55x = 1,519.76 × 525.94
4. Step 4: Simplify right side
   1,012.55x = 799,300.09
5. Step 5: Solve for x
   x = 799,300.09/1,012.55
6. Step 6: Final answer
   x = 789.40