Finding the Fourth Proportional to 2,111.45, 2,913.93 and 1,272.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.45 : 2,913.93 = 1,272.15 : x
2. Step 2: Convert to fraction form
   2,111.45/2,913.93 = 1,272.15/x
3. Step 3: Cross multiply
   2,111.45x = 2,913.93 × 1,272.15
4. Step 4: Simplify right side
   2,111.45x = 3,706,956.05
5. Step 5: Solve for x
   x = 3,706,956.05/2,111.45
6. Step 6: Final answer
   x = 1,755.65