Finding the Fourth Proportional to 1,056.84, 1,582.80 and 690.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.84 : 1,582.80 = 690.72 : x
2. Step 2: Convert to fraction form
   1,056.84/1,582.80 = 690.72/x
3. Step 3: Cross multiply
   1,056.84x = 1,582.80 × 690.72
4. Step 4: Simplify right side
   1,056.84x = 1,093,271.62
5. Step 5: Solve for x
   x = 1,093,271.62/1,056.84
6. Step 6: Final answer
   x = 1,034.47