Finding the Fourth Proportional to 1,433.18, 1,975.98 and 990.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.18 : 1,975.98 = 990.32 : x
2. Step 2: Convert to fraction form
   1,433.18/1,975.98 = 990.32/x
3. Step 3: Cross multiply
   1,433.18x = 1,975.98 × 990.32
4. Step 4: Simplify right side
   1,433.18x = 1,956,852.51
5. Step 5: Solve for x
   x = 1,956,852.51/1,433.18
6. Step 6: Final answer
   x = 1,365.39