Finding the Fourth Proportional to 1,309.56, 1,807.07 and 719.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.56 : 1,807.07 = 719.94 : x
2. Step 2: Convert to fraction form
   1,309.56/1,807.07 = 719.94/x
3. Step 3: Cross multiply
   1,309.56x = 1,807.07 × 719.94
4. Step 4: Simplify right side
   1,309.56x = 1,300,981.98
5. Step 5: Solve for x
   x = 1,300,981.98/1,309.56
6. Step 6: Final answer
   x = 993.45