Finding the Fourth Proportional to 1,139.94, 1,708.53 and 522.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.94 : 1,708.53 = 522.79 : x
2. Step 2: Convert to fraction form
   1,139.94/1,708.53 = 522.79/x
3. Step 3: Cross multiply
   1,139.94x = 1,708.53 × 522.79
4. Step 4: Simplify right side
   1,139.94x = 893,196.17
5. Step 5: Solve for x
   x = 893,196.17/1,139.94
6. Step 6: Final answer
   x = 783.55