Finding the Fourth Proportional to 1,690.17, 2,333.28 and 1,061.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,690.17 : 2,333.28 = 1,061.61 : x
2. Step 2: Convert to fraction form
   1,690.17/2,333.28 = 1,061.61/x
3. Step 3: Cross multiply
   1,690.17x = 2,333.28 × 1,061.61
4. Step 4: Simplify right side
   1,690.17x = 2,477,033.38
5. Step 5: Solve for x
   x = 2,477,033.38/1,690.17
6. Step 6: Final answer
   x = 1,465.55