Finding the Fourth Proportional to 2,312.80, 3,191.72 and 1,416.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.80 : 3,191.72 = 1,416.68 : x
2. Step 2: Convert to fraction form
   2,312.80/3,191.72 = 1,416.68/x
3. Step 3: Cross multiply
   2,312.80x = 3,191.72 × 1,416.68
4. Step 4: Simplify right side
   2,312.80x = 4,521,645.89
5. Step 5: Solve for x
   x = 4,521,645.89/2,312.80
6. Step 6: Final answer
   x = 1,955.05