Finding the Fourth Proportional to 1,417.56, 2,115.91 and 1,316.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.56 : 2,115.91 = 1,316.12 : x
2. Step 2: Convert to fraction form
   1,417.56/2,115.91 = 1,316.12/x
3. Step 3: Cross multiply
   1,417.56x = 2,115.91 × 1,316.12
4. Step 4: Simplify right side
   1,417.56x = 2,784,791.47
5. Step 5: Solve for x
   x = 2,784,791.47/1,417.56
6. Step 6: Final answer
   x = 1,964.50