Finding the Fourth Proportional to 1,770.86, 2,654.98 and 1,221.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,770.86 : 2,654.98 = 1,221.48 : x
2. Step 2: Convert to fraction form
   1,770.86/2,654.98 = 1,221.48/x
3. Step 3: Cross multiply
   1,770.86x = 2,654.98 × 1,221.48
4. Step 4: Simplify right side
   1,770.86x = 3,243,001.92
5. Step 5: Solve for x
   x = 3,243,001.92/1,770.86
6. Step 6: Final answer
   x = 1,831.31