Finding the Fourth Proportional to 2,151.59, 2,969.09 and 1,312.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.59 : 2,969.09 = 1,312.16 : x
2. Step 2: Convert to fraction form
   2,151.59/2,969.09 = 1,312.16/x
3. Step 3: Cross multiply
   2,151.59x = 2,969.09 × 1,312.16
4. Step 4: Simplify right side
   2,151.59x = 3,895,904.65
5. Step 5: Solve for x
   x = 3,895,904.65/2,151.59
6. Step 6: Final answer
   x = 1,810.71