Finding the Fourth Proportional to 942.31, 1,300.76 and 917.47

Step by Step Solution

1. Step 1: Write the proportion equation
   942.31 : 1,300.76 = 917.47 : x
2. Step 2: Convert to fraction form
   942.31/1,300.76 = 917.47/x
3. Step 3: Cross multiply
   942.31x = 1,300.76 × 917.47
4. Step 4: Simplify right side
   942.31x = 1,193,408.28
5. Step 5: Solve for x
   x = 1,193,408.28/942.31
6. Step 6: Final answer
   x = 1,266.47