Finding the Fourth Proportional to 866.01, 1,196.31 and 690.10

Step by Step Solution

1. Step 1: Write the proportion equation
   866.01 : 1,196.31 = 690.10 : x
2. Step 2: Convert to fraction form
   866.01/1,196.31 = 690.10/x
3. Step 3: Cross multiply
   866.01x = 1,196.31 × 690.10
4. Step 4: Simplify right side
   866.01x = 825,573.53
5. Step 5: Solve for x
   x = 825,573.53/866.01
6. Step 6: Final answer
   x = 953.31