Finding the Fourth Proportional to 1,435.65, 1,980.89 and 939.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.65 : 1,980.89 = 939.02 : x
2. Step 2: Convert to fraction form
   1,435.65/1,980.89 = 939.02/x
3. Step 3: Cross multiply
   1,435.65x = 1,980.89 × 939.02
4. Step 4: Simplify right side
   1,435.65x = 1,860,080.73
5. Step 5: Solve for x
   x = 1,860,080.73/1,435.65
6. Step 6: Final answer
   x = 1,295.64