Finding the Fourth Proportional to 1,105.79, 1,526.62 and 686.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.79 : 1,526.62 = 686.32 : x
2. Step 2: Convert to fraction form
   1,105.79/1,526.62 = 686.32/x
3. Step 3: Cross multiply
   1,105.79x = 1,526.62 × 686.32
4. Step 4: Simplify right side
   1,105.79x = 1,047,744.31
5. Step 5: Solve for x
   x = 1,047,744.31/1,105.79
6. Step 6: Final answer
   x = 947.51