Finding the Fourth Proportional to 1,808.17, 2,710.94 and 1,221.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,808.17 : 2,710.94 = 1,221.72 : x
2. Step 2: Convert to fraction form
   1,808.17/2,710.94 = 1,221.72/x
3. Step 3: Cross multiply
   1,808.17x = 2,710.94 × 1,221.72
4. Step 4: Simplify right side
   1,808.17x = 3,312,009.62
5. Step 5: Solve for x
   x = 3,312,009.62/1,808.17
6. Step 6: Final answer
   x = 1,831.69