Finding the Fourth Proportional to 1,509.79, 2,083.78 and 1,012.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,509.79 : 2,083.78 = 1,012.50 : x
2. Step 2: Convert to fraction form
   1,509.79/2,083.78 = 1,012.50/x
3. Step 3: Cross multiply
   1,509.79x = 2,083.78 × 1,012.50
4. Step 4: Simplify right side
   1,509.79x = 2,109,816.83
5. Step 5: Solve for x
   x = 2,109,816.83/1,509.79
6. Step 6: Final answer
   x = 1,397.42