Finding the Fourth Proportional to 2,051.98, 3,079.10 and 1,272.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,051.98 : 3,079.10 = 1,272.40 : x
2. Step 2: Convert to fraction form
   2,051.98/3,079.10 = 1,272.40/x
3. Step 3: Cross multiply
   2,051.98x = 3,079.10 × 1,272.40
4. Step 4: Simplify right side
   2,051.98x = 3,917,842.32
5. Step 5: Solve for x
   x = 3,917,842.32/2,051.98
6. Step 6: Final answer
   x = 1,909.30