Finding the Fourth Proportional to 1,091.34, 1,505.79 and 698.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.34 : 1,505.79 = 698.49 : x
2. Step 2: Convert to fraction form
   1,091.34/1,505.79 = 698.49/x
3. Step 3: Cross multiply
   1,091.34x = 1,505.79 × 698.49
4. Step 4: Simplify right side
   1,091.34x = 1,051,779.26
5. Step 5: Solve for x
   x = 1,051,779.26/1,091.34
6. Step 6: Final answer
   x = 963.75