Finding the Fourth Proportional to 1,928.48, 2,890.29 and 1,061.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,928.48 : 2,890.29 = 1,061.78 : x
2. Step 2: Convert to fraction form
   1,928.48/2,890.29 = 1,061.78/x
3. Step 3: Cross multiply
   1,928.48x = 2,890.29 × 1,061.78
4. Step 4: Simplify right side
   1,928.48x = 3,068,852.12
5. Step 5: Solve for x
   x = 3,068,852.12/1,928.48
6. Step 6: Final answer
   x = 1,591.33