Finding the Fourth Proportional to 1,091.33, 1,505.54 and 648.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.33 : 1,505.54 = 648.98 : x
2. Step 2: Convert to fraction form
   1,091.33/1,505.54 = 648.98/x
3. Step 3: Cross multiply
   1,091.33x = 1,505.54 × 648.98
4. Step 4: Simplify right side
   1,091.33x = 977,070.74
5. Step 5: Solve for x
   x = 977,070.74/1,091.33
6. Step 6: Final answer
   x = 895.30