Finding the Fourth Proportional to 2,071.67, 3,106.58 and 838.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.67 : 3,106.58 = 838.76 : x
2. Step 2: Convert to fraction form
   2,071.67/3,106.58 = 838.76/x
3. Step 3: Cross multiply
   2,071.67x = 3,106.58 × 838.76
4. Step 4: Simplify right side
   2,071.67x = 2,605,655.31
5. Step 5: Solve for x
   x = 2,605,655.31/2,071.67
6. Step 6: Final answer
   x = 1,257.76