Finding the Fourth Proportional to 1,605.63, 2,215.50 and 976.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.63 : 2,215.50 = 976.05 : x
2. Step 2: Convert to fraction form
   1,605.63/2,215.50 = 976.05/x
3. Step 3: Cross multiply
   1,605.63x = 2,215.50 × 976.05
4. Step 4: Simplify right side
   1,605.63x = 2,162,438.78
5. Step 5: Solve for x
   x = 2,162,438.78/1,605.63
6. Step 6: Final answer
   x = 1,346.79