Finding the Fourth Proportional to 1,139.51, 1,707.89 and 522.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.51 : 1,707.89 = 522.37 : x
2. Step 2: Convert to fraction form
   1,139.51/1,707.89 = 522.37/x
3. Step 3: Cross multiply
   1,139.51x = 1,707.89 × 522.37
4. Step 4: Simplify right side
   1,139.51x = 892,144.82
5. Step 5: Solve for x
   x = 892,144.82/1,139.51
6. Step 6: Final answer
   x = 782.92