Finding the Fourth Proportional to 1,086.49, 1,498.80 and 693.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.49 : 1,498.80 = 693.10 : x
2. Step 2: Convert to fraction form
   1,086.49/1,498.80 = 693.10/x
3. Step 3: Cross multiply
   1,086.49x = 1,498.80 × 693.10
4. Step 4: Simplify right side
   1,086.49x = 1,038,818.28
5. Step 5: Solve for x
   x = 1,038,818.28/1,086.49
6. Step 6: Final answer
   x = 956.12