Finding the Fourth Proportional to 1,309.59, 1,807.34 and 866.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.59 : 1,807.34 = 866.72 : x
2. Step 2: Convert to fraction form
   1,309.59/1,807.34 = 866.72/x
3. Step 3: Cross multiply
   1,309.59x = 1,807.34 × 866.72
4. Step 4: Simplify right side
   1,309.59x = 1,566,457.91
5. Step 5: Solve for x
   x = 1,566,457.91/1,309.59
6. Step 6: Final answer
   x = 1,196.14