Finding the Fourth Proportional to 1,622.10, 2,238.42 and 913.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,622.10 : 2,238.42 = 913.96 : x
2. Step 2: Convert to fraction form
   1,622.10/2,238.42 = 913.96/x
3. Step 3: Cross multiply
   1,622.10x = 2,238.42 × 913.96
4. Step 4: Simplify right side
   1,622.10x = 2,045,826.34
5. Step 5: Solve for x
   x = 2,045,826.34/1,622.10
6. Step 6: Final answer
   x = 1,261.22