Finding the Fourth Proportional to 2,279.17, 3,139.86 and 1,878.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,279.17 : 3,139.86 = 1,878.22 : x
2. Step 2: Convert to fraction form
   2,279.17/3,139.86 = 1,878.22/x
3. Step 3: Cross multiply
   2,279.17x = 3,139.86 × 1,878.22
4. Step 4: Simplify right side
   2,279.17x = 5,897,347.85
5. Step 5: Solve for x
   x = 5,897,347.85/2,279.17
6. Step 6: Final answer
   x = 2,587.50