Finding the Fourth Proportional to 2,156.49, 2,975.79 and 1,212.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.49 : 2,975.79 = 1,212.13 : x
2. Step 2: Convert to fraction form
   2,156.49/2,975.79 = 1,212.13/x
3. Step 3: Cross multiply
   2,156.49x = 2,975.79 × 1,212.13
4. Step 4: Simplify right side
   2,156.49x = 3,607,050.89
5. Step 5: Solve for x
   x = 3,607,050.89/2,156.49
6. Step 6: Final answer
   x = 1,672.65