Finding the Fourth Proportional to 1,428.63, 1,970.79 and 924.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.63 : 1,970.79 = 924.30 : x
2. Step 2: Convert to fraction form
   1,428.63/1,970.79 = 924.30/x
3. Step 3: Cross multiply
   1,428.63x = 1,970.79 × 924.30
4. Step 4: Simplify right side
   1,428.63x = 1,821,601.20
5. Step 5: Solve for x
   x = 1,821,601.20/1,428.63
6. Step 6: Final answer
   x = 1,275.07