Finding the Fourth Proportional to 1,030.30, 1,422.42 and 637.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.30 : 1,422.42 = 637.86 : x
2. Step 2: Convert to fraction form
   1,030.30/1,422.42 = 637.86/x
3. Step 3: Cross multiply
   1,030.30x = 1,422.42 × 637.86
4. Step 4: Simplify right side
   1,030.30x = 907,304.82
5. Step 5: Solve for x
   x = 907,304.82/1,030.30
6. Step 6: Final answer
   x = 880.62