Finding the Fourth Proportional to 1,109.76, 1,531.88 and 690.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.76 : 1,531.88 = 690.51 : x
2. Step 2: Convert to fraction form
   1,109.76/1,531.88 = 690.51/x
3. Step 3: Cross multiply
   1,109.76x = 1,531.88 × 690.51
4. Step 4: Simplify right side
   1,109.76x = 1,057,778.46
5. Step 5: Solve for x
   x = 1,057,778.46/1,109.76
6. Step 6: Final answer
   x = 953.16