Finding the Fourth Proportional to 1,432.17, 1,974.24 and 990.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,432.17 : 1,974.24 = 990.99 : x
2. Step 2: Convert to fraction form
   1,432.17/1,974.24 = 990.99/x
3. Step 3: Cross multiply
   1,432.17x = 1,974.24 × 990.99
4. Step 4: Simplify right side
   1,432.17x = 1,956,452.10
5. Step 5: Solve for x
   x = 1,956,452.10/1,432.17
6. Step 6: Final answer
   x = 1,366.08