Finding the Fourth Proportional to 1,912.59, 2,639.51 and 1,061.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,912.59 : 2,639.51 = 1,061.89 : x
2. Step 2: Convert to fraction form
   1,912.59/2,639.51 = 1,061.89/x
3. Step 3: Cross multiply
   1,912.59x = 2,639.51 × 1,061.89
4. Step 4: Simplify right side
   1,912.59x = 2,802,850.77
5. Step 5: Solve for x
   x = 2,802,850.77/1,912.59
6. Step 6: Final answer
   x = 1,465.48