Finding the Fourth Proportional to 2,779.86, 4,170.72 and 931.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,779.86 : 4,170.72 = 931.16 : x
2. Step 2: Convert to fraction form
   2,779.86/4,170.72 = 931.16/x
3. Step 3: Cross multiply
   2,779.86x = 4,170.72 × 931.16
4. Step 4: Simplify right side
   2,779.86x = 3,883,607.64
5. Step 5: Solve for x
   x = 3,883,607.64/2,779.86
6. Step 6: Final answer
   x = 1,397.05