Finding the Fourth Proportional to 1,061.90, 1,594.67 and 515.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.90 : 1,594.67 = 515.15 : x
2. Step 2: Convert to fraction form
   1,061.90/1,594.67 = 515.15/x
3. Step 3: Cross multiply
   1,061.90x = 1,594.67 × 515.15
4. Step 4: Simplify right side
   1,061.90x = 821,494.25
5. Step 5: Solve for x
   x = 821,494.25/1,061.90
6. Step 6: Final answer
   x = 773.61