Finding the Fourth Proportional to 1,006.56, 1,507.23 and 810.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,006.56 : 1,507.23 = 810.72 : x
2. Step 2: Convert to fraction form
   1,006.56/1,507.23 = 810.72/x
3. Step 3: Cross multiply
   1,006.56x = 1,507.23 × 810.72
4. Step 4: Simplify right side
   1,006.56x = 1,221,941.51
5. Step 5: Solve for x
   x = 1,221,941.51/1,006.56
6. Step 6: Final answer
   x = 1,213.98