Finding the Fourth Proportional to 2,153.12, 2,970.27 and 1,913.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,153.12 : 2,970.27 = 1,913.78 : x
2. Step 2: Convert to fraction form
   2,153.12/2,970.27 = 1,913.78/x
3. Step 3: Cross multiply
   2,153.12x = 2,970.27 × 1,913.78
4. Step 4: Simplify right side
   2,153.12x = 5,684,443.32
5. Step 5: Solve for x
   x = 5,684,443.32/2,153.12
6. Step 6: Final answer
   x = 2,640.10