Finding the Fourth Proportional to 1,061.35, 1,593.82 and 691.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.35 : 1,593.82 = 691.78 : x
2. Step 2: Convert to fraction form
   1,061.35/1,593.82 = 691.78/x
3. Step 3: Cross multiply
   1,061.35x = 1,593.82 × 691.78
4. Step 4: Simplify right side
   1,061.35x = 1,102,569.34
5. Step 5: Solve for x
   x = 1,102,569.34/1,061.35
6. Step 6: Final answer
   x = 1,038.84