Finding the Fourth Proportional to 1,091.98, 1,507.05 and 649.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.98 : 1,507.05 = 649.88 : x
2. Step 2: Convert to fraction form
   1,091.98/1,507.05 = 649.88/x
3. Step 3: Cross multiply
   1,091.98x = 1,507.05 × 649.88
4. Step 4: Simplify right side
   1,091.98x = 979,397.89
5. Step 5: Solve for x
   x = 979,397.89/1,091.98
6. Step 6: Final answer
   x = 896.91