Finding the Fourth Proportional to 1,300.78, 1,795.06 and 711.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.78 : 1,795.06 = 711.31 : x
2. Step 2: Convert to fraction form
   1,300.78/1,795.06 = 711.31/x
3. Step 3: Cross multiply
   1,300.78x = 1,795.06 × 711.31
4. Step 4: Simplify right side
   1,300.78x = 1,276,844.13
5. Step 5: Solve for x
   x = 1,276,844.13/1,300.78
6. Step 6: Final answer
   x = 981.60