Finding the Fourth Proportional to 1,315.69, 1,975.56 and 1,111.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.69 : 1,975.56 = 1,111.84 : x
2. Step 2: Convert to fraction form
   1,315.69/1,975.56 = 1,111.84/x
3. Step 3: Cross multiply
   1,315.69x = 1,975.56 × 1,111.84
4. Step 4: Simplify right side
   1,315.69x = 2,196,506.63
5. Step 5: Solve for x
   x = 2,196,506.63/1,315.69
6. Step 6: Final answer
   x = 1,669.47