Finding the Fourth Proportional to 1,337.78, 2,005.25 and 515.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,337.78 : 2,005.25 = 515.69 : x
2. Step 2: Convert to fraction form
   1,337.78/2,005.25 = 515.69/x
3. Step 3: Cross multiply
   1,337.78x = 2,005.25 × 515.69
4. Step 4: Simplify right side
   1,337.78x = 1,034,089.81
5. Step 5: Solve for x
   x = 1,034,089.81/1,337.78
6. Step 6: Final answer
   x = 772.99