Finding the Fourth Proportional to 1,658.50, 2,288.72 and 912.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,658.50 : 2,288.72 = 912.47 : x
2. Step 2: Convert to fraction form
   1,658.50/2,288.72 = 912.47/x
3. Step 3: Cross multiply
   1,658.50x = 2,288.72 × 912.47
4. Step 4: Simplify right side
   1,658.50x = 2,088,379.18
5. Step 5: Solve for x
   x = 2,088,379.18/1,658.50
6. Step 6: Final answer
   x = 1,259.20