Finding the Fourth Proportional to 1,395.11, 2,094.72 and 780.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.11 : 2,094.72 = 780.02 : x
2. Step 2: Convert to fraction form
   1,395.11/2,094.72 = 780.02/x
3. Step 3: Cross multiply
   1,395.11x = 2,094.72 × 780.02
4. Step 4: Simplify right side
   1,395.11x = 1,633,923.49
5. Step 5: Solve for x
   x = 1,633,923.49/1,395.11
6. Step 6: Final answer
   x = 1,171.18