Finding the Fourth Proportional to 1,435.98, 1,980.81 and 904.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.98 : 1,980.81 = 904.65 : x
2. Step 2: Convert to fraction form
   1,435.98/1,980.81 = 904.65/x
3. Step 3: Cross multiply
   1,435.98x = 1,980.81 × 904.65
4. Step 4: Simplify right side
   1,435.98x = 1,791,939.77
5. Step 5: Solve for x
   x = 1,791,939.77/1,435.98
6. Step 6: Final answer
   x = 1,247.89