Finding the Fourth Proportional to 1,308.86, 1,806.32 and 719.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.86 : 1,806.32 = 719.40 : x
2. Step 2: Convert to fraction form
   1,308.86/1,806.32 = 719.40/x
3. Step 3: Cross multiply
   1,308.86x = 1,806.32 × 719.40
4. Step 4: Simplify right side
   1,308.86x = 1,299,466.61
5. Step 5: Solve for x
   x = 1,299,466.61/1,308.86
6. Step 6: Final answer
   x = 992.82