Finding the Fourth Proportional to 1,336.78, 2,005.98 and 790.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,336.78 : 2,005.98 = 790.03 : x
2. Step 2: Convert to fraction form
   1,336.78/2,005.98 = 790.03/x
3. Step 3: Cross multiply
   1,336.78x = 2,005.98 × 790.03
4. Step 4: Simplify right side
   1,336.78x = 1,584,784.38
5. Step 5: Solve for x
   x = 1,584,784.38/1,336.78
6. Step 6: Final answer
   x = 1,185.52