Finding the Fourth Proportional to 2,012.16, 3,015.60 and 916.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.16 : 3,015.60 = 916.32 : x
2. Step 2: Convert to fraction form
   2,012.16/3,015.60 = 916.32/x
3. Step 3: Cross multiply
   2,012.16x = 3,015.60 × 916.32
4. Step 4: Simplify right side
   2,012.16x = 2,763,254.59
5. Step 5: Solve for x
   x = 2,763,254.59/2,012.16
6. Step 6: Final answer
   x = 1,373.28