Finding the Fourth Proportional to 1,105.84, 1,526.14 and 640.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.84 : 1,526.14 = 640.18 : x
2. Step 2: Convert to fraction form
   1,105.84/1,526.14 = 640.18/x
3. Step 3: Cross multiply
   1,105.84x = 1,526.14 × 640.18
4. Step 4: Simplify right side
   1,105.84x = 977,004.31
5. Step 5: Solve for x
   x = 977,004.31/1,105.84
6. Step 6: Final answer
   x = 883.50