Finding the Fourth Proportional to 2,623.05, 3,932.96 and 891.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,623.05 : 3,932.96 = 891.81 : x
2. Step 2: Convert to fraction form
   2,623.05/3,932.96 = 891.81/x
3. Step 3: Cross multiply
   2,623.05x = 3,932.96 × 891.81
4. Step 4: Simplify right side
   2,623.05x = 3,507,448.60
5. Step 5: Solve for x
   x = 3,507,448.60/2,623.05
6. Step 6: Final answer
   x = 1,337.16