Finding the Fourth Proportional to 2,992.16, 4,488.31 and 912.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,992.16 : 4,488.31 = 912.15 : x
2. Step 2: Convert to fraction form
   2,992.16/4,488.31 = 912.15/x
3. Step 3: Cross multiply
   2,992.16x = 4,488.31 × 912.15
4. Step 4: Simplify right side
   2,992.16x = 4,094,009.69
5. Step 5: Solve for x
   x = 4,094,009.69/2,992.16
6. Step 6: Final answer
   x = 1,368.25