Finding the Fourth Proportional to 1,811.02, 2,498.40 and 1,221.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,811.02 : 2,498.40 = 1,221.34 : x
2. Step 2: Convert to fraction form
   1,811.02/2,498.40 = 1,221.34/x
3. Step 3: Cross multiply
   1,811.02x = 2,498.40 × 1,221.34
4. Step 4: Simplify right side
   1,811.02x = 3,051,395.86
5. Step 5: Solve for x
   x = 3,051,395.86/1,811.02
6. Step 6: Final answer
   x = 1,684.90