Finding the Fourth Proportional to 1,420.84, 1,961.70 and 917.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.84 : 1,961.70 = 917.62 : x
2. Step 2: Convert to fraction form
   1,420.84/1,961.70 = 917.62/x
3. Step 3: Cross multiply
   1,420.84x = 1,961.70 × 917.62
4. Step 4: Simplify right side
   1,420.84x = 1,800,095.15
5. Step 5: Solve for x
   x = 1,800,095.15/1,420.84
6. Step 6: Final answer
   x = 1,266.92