Finding the Fourth Proportional to 1,864, 2,572.17 and 1,078.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,864 : 2,572.17 = 1,078.10 : x
2. Step 2: Convert to fraction form
   1,864/2,572.17 = 1,078.10/x
3. Step 3: Cross multiply
   1,864x = 2,572.17 × 1,078.10
4. Step 4: Simplify right side
   1,864x = 2,773,056.48
5. Step 5: Solve for x
   x = 2,773,056.48/1,864
6. Step 6: Final answer
   x = 1,487.69