Finding the Fourth Proportional to 1,839.90, 2,538.56 and 1,279.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,839.90 : 2,538.56 = 1,279.74 : x
2. Step 2: Convert to fraction form
   1,839.90/2,538.56 = 1,279.74/x
3. Step 3: Cross multiply
   1,839.90x = 2,538.56 × 1,279.74
4. Step 4: Simplify right side
   1,839.90x = 3,248,696.77
5. Step 5: Solve for x
   x = 3,248,696.77/1,839.90
6. Step 6: Final answer
   x = 1,765.69