Finding the Fourth Proportional to 1,422.68, 1,963.86 and 1,003.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.68 : 1,963.86 = 1,003.64 : x
2. Step 2: Convert to fraction form
   1,422.68/1,963.86 = 1,003.64/x
3. Step 3: Cross multiply
   1,422.68x = 1,963.86 × 1,003.64
4. Step 4: Simplify right side
   1,422.68x = 1,971,008.45
5. Step 5: Solve for x
   x = 1,971,008.45/1,422.68
6. Step 6: Final answer
   x = 1,385.42