Finding the Fourth Proportional to 1,005.61, 1,507.53 and 810.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,005.61 : 1,507.53 = 810.27 : x
2. Step 2: Convert to fraction form
   1,005.61/1,507.53 = 810.27/x
3. Step 3: Cross multiply
   1,005.61x = 1,507.53 × 810.27
4. Step 4: Simplify right side
   1,005.61x = 1,221,506.33
5. Step 5: Solve for x
   x = 1,221,506.33/1,005.61
6. Step 6: Final answer
   x = 1,214.69