Finding the Fourth Proportional to 1,404.56, 2,115.68 and 1,318.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.56 : 2,115.68 = 1,318.16 : x
2. Step 2: Convert to fraction form
   1,404.56/2,115.68 = 1,318.16/x
3. Step 3: Cross multiply
   1,404.56x = 2,115.68 × 1,318.16
4. Step 4: Simplify right side
   1,404.56x = 2,788,804.75
5. Step 5: Solve for x
   x = 2,788,804.75/1,404.56
6. Step 6: Final answer
   x = 1,985.54