Finding the Fourth Proportional to 1,436.30, 1,981.60 and 912.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.30 : 1,981.60 = 912.63 : x
2. Step 2: Convert to fraction form
   1,436.30/1,981.60 = 912.63/x
3. Step 3: Cross multiply
   1,436.30x = 1,981.60 × 912.63
4. Step 4: Simplify right side
   1,436.30x = 1,808,467.61
5. Step 5: Solve for x
   x = 1,808,467.61/1,436.30
6. Step 6: Final answer
   x = 1,259.12