Finding the Fourth Proportional to 2,140.72, 2,952.80 and 1,312.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.72 : 2,952.80 = 1,312.72 : x
2. Step 2: Convert to fraction form
   2,140.72/2,952.80 = 1,312.72/x
3. Step 3: Cross multiply
   2,140.72x = 2,952.80 × 1,312.72
4. Step 4: Simplify right side
   2,140.72x = 3,876,199.62
5. Step 5: Solve for x
   x = 3,876,199.62/2,140.72
6. Step 6: Final answer
   x = 1,810.70