Finding the Fourth Proportional to 1,435.84, 1,980.88 and 971.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.84 : 1,980.88 = 971.36 : x
2. Step 2: Convert to fraction form
   1,435.84/1,980.88 = 971.36/x
3. Step 3: Cross multiply
   1,435.84x = 1,980.88 × 971.36
4. Step 4: Simplify right side
   1,435.84x = 1,924,147.60
5. Step 5: Solve for x
   x = 1,924,147.60/1,435.84
6. Step 6: Final answer
   x = 1,340.08