Finding the Fourth Proportional to 1,061.38, 1,590.45 and 696.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.38 : 1,590.45 = 696.70 : x
2. Step 2: Convert to fraction form
   1,061.38/1,590.45 = 696.70/x
3. Step 3: Cross multiply
   1,061.38x = 1,590.45 × 696.70
4. Step 4: Simplify right side
   1,061.38x = 1,108,066.52
5. Step 5: Solve for x
   x = 1,108,066.52/1,061.38
6. Step 6: Final answer
   x = 1,043.99