Finding the Fourth Proportional to 1,333.50, 1,840.64 and 985.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,333.50 : 1,840.64 = 985.20 : x
2. Step 2: Convert to fraction form
   1,333.50/1,840.64 = 985.20/x
3. Step 3: Cross multiply
   1,333.50x = 1,840.64 × 985.20
4. Step 4: Simplify right side
   1,333.50x = 1,813,393.60
5. Step 5: Solve for x
   x = 1,813,393.60/1,333.50
6. Step 6: Final answer
   x = 1,359.88