Finding the Fourth Proportional to 1,812.85, 2,500.35 and 1,215.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,812.85 : 2,500.35 = 1,215.16 : x
2. Step 2: Convert to fraction form
   1,812.85/2,500.35 = 1,215.16/x
3. Step 3: Cross multiply
   1,812.85x = 2,500.35 × 1,215.16
4. Step 4: Simplify right side
   1,812.85x = 3,038,314.50
5. Step 5: Solve for x
   x = 3,038,314.50/1,812.85
6. Step 6: Final answer
   x = 1,675.99