Finding the Fourth Proportional to 1,335.42, 1,999.86 and 1,228.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.42 : 1,999.86 = 1,228.50 : x
2. Step 2: Convert to fraction form
   1,335.42/1,999.86 = 1,228.50/x
3. Step 3: Cross multiply
   1,335.42x = 1,999.86 × 1,228.50
4. Step 4: Simplify right side
   1,335.42x = 2,456,828.01
5. Step 5: Solve for x
   x = 2,456,828.01/1,335.42
6. Step 6: Final answer
   x = 1,839.74