Finding the Fourth Proportional to 1,622.15, 2,431.73 and 788.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,622.15 : 2,431.73 = 788.72 : x
2. Step 2: Convert to fraction form
   1,622.15/2,431.73 = 788.72/x
3. Step 3: Cross multiply
   1,622.15x = 2,431.73 × 788.72
4. Step 4: Simplify right side
   1,622.15x = 1,917,954.09
5. Step 5: Solve for x
   x = 1,917,954.09/1,622.15
6. Step 6: Final answer
   x = 1,182.35