Finding the Fourth Proportional to 2,156.50, 2,975.93 and 1,212.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.50 : 2,975.93 = 1,212.30 : x
2. Step 2: Convert to fraction form
   2,156.50/2,975.93 = 1,212.30/x
3. Step 3: Cross multiply
   2,156.50x = 2,975.93 × 1,212.30
4. Step 4: Simplify right side
   2,156.50x = 3,607,713.88
5. Step 5: Solve for x
   x = 3,607,713.88/2,156.50
6. Step 6: Final answer
   x = 1,672.95