Finding the Fourth Proportional to 1,510.75, 2,085.78 and 1,039.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.75 : 2,085.78 = 1,039.42 : x
2. Step 2: Convert to fraction form
   1,510.75/2,085.78 = 1,039.42/x
3. Step 3: Cross multiply
   1,510.75x = 2,085.78 × 1,039.42
4. Step 4: Simplify right side
   1,510.75x = 2,168,001.45
5. Step 5: Solve for x
   x = 2,168,001.45/1,510.75
6. Step 6: Final answer
   x = 1,435.05