Finding the Fourth Proportional to 1,335.05, 1,836.78 and 1,298.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,335.05 : 1,836.78 = 1,298.60 : x
2. Step 2: Convert to fraction form
   1,335.05/1,836.78 = 1,298.60/x
3. Step 3: Cross multiply
   1,335.05x = 1,836.78 × 1,298.60
4. Step 4: Simplify right side
   1,335.05x = 2,385,242.51
5. Step 5: Solve for x
   x = 2,385,242.51/1,335.05
6. Step 6: Final answer
   x = 1,786.63