Finding the Fourth Proportional to 1,131.76, 1,688.10 and 1,097.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.76 : 1,688.10 = 1,097.16 : x
2. Step 2: Convert to fraction form
   1,131.76/1,688.10 = 1,097.16/x
3. Step 3: Cross multiply
   1,131.76x = 1,688.10 × 1,097.16
4. Step 4: Simplify right side
   1,131.76x = 1,852,110.31
5. Step 5: Solve for x
   x = 1,852,110.31/1,131.76
6. Step 6: Final answer
   x = 1,636.49