Finding the Fourth Proportional to 1,030.04, 1,421.72 and 637.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.04 : 1,421.72 = 637.40 : x
2. Step 2: Convert to fraction form
   1,030.04/1,421.72 = 637.40/x
3. Step 3: Cross multiply
   1,030.04x = 1,421.72 × 637.40
4. Step 4: Simplify right side
   1,030.04x = 906,204.33
5. Step 5: Solve for x
   x = 906,204.33/1,030.04
6. Step 6: Final answer
   x = 879.78