Finding the Fourth Proportional to 1,335.57, 1,841.31 and 1,021.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.57 : 1,841.31 = 1,021.02 : x
2. Step 2: Convert to fraction form
   1,335.57/1,841.31 = 1,021.02/x
3. Step 3: Cross multiply
   1,335.57x = 1,841.31 × 1,021.02
4. Step 4: Simplify right side
   1,335.57x = 1,880,014.34
5. Step 5: Solve for x
   x = 1,880,014.34/1,335.57
6. Step 6: Final answer
   x = 1,407.65