Finding the Fourth Proportional to 2,154.02, 2,971.77 and 1,221.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,154.02 : 2,971.77 = 1,221.98 : x
2. Step 2: Convert to fraction form
   2,154.02/2,971.77 = 1,221.98/x
3. Step 3: Cross multiply
   2,154.02x = 2,971.77 × 1,221.98
4. Step 4: Simplify right side
   2,154.02x = 3,631,443.50
5. Step 5: Solve for x
   x = 3,631,443.50/2,154.02
6. Step 6: Final answer
   x = 1,685.89