Finding the Fourth Proportional to 1,272.10, 1,911.98 and 1,054.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.10 : 1,911.98 = 1,054.16 : x
2. Step 2: Convert to fraction form
   1,272.10/1,911.98 = 1,054.16/x
3. Step 3: Cross multiply
   1,272.10x = 1,911.98 × 1,054.16
4. Step 4: Simplify right side
   1,272.10x = 2,015,532.35
5. Step 5: Solve for x
   x = 2,015,532.35/1,272.10
6. Step 6: Final answer
   x = 1,584.41