Finding the Fourth Proportional to 2,109.31, 3,160.72 and 875.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.31 : 3,160.72 = 875.68 : x
2. Step 2: Convert to fraction form
   2,109.31/3,160.72 = 875.68/x
3. Step 3: Cross multiply
   2,109.31x = 3,160.72 × 875.68
4. Step 4: Simplify right side
   2,109.31x = 2,767,779.29
5. Step 5: Solve for x
   x = 2,767,779.29/2,109.31
6. Step 6: Final answer
   x = 1,312.17