Finding the Fourth Proportional to 1,109.95, 1,531.15 and 690.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.95 : 1,531.15 = 690.19 : x
2. Step 2: Convert to fraction form
   1,109.95/1,531.15 = 690.19/x
3. Step 3: Cross multiply
   1,109.95x = 1,531.15 × 690.19
4. Step 4: Simplify right side
   1,109.95x = 1,056,784.42
5. Step 5: Solve for x
   x = 1,056,784.42/1,109.95
6. Step 6: Final answer
   x = 952.10