Finding the Fourth Proportional to 2,156.63, 2,976.50 and 1,272.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.63 : 2,976.50 = 1,272.65 : x
2. Step 2: Convert to fraction form
   2,156.63/2,976.50 = 1,272.65/x
3. Step 3: Cross multiply
   2,156.63x = 2,976.50 × 1,272.65
4. Step 4: Simplify right side
   2,156.63x = 3,788,031.02
5. Step 5: Solve for x
   x = 3,788,031.02/2,156.63
6. Step 6: Final answer
   x = 1,756.46