Finding the Fourth Proportional to 1,030.56, 1,422.30 and 637.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.56 : 1,422.30 = 637.98 : x
2. Step 2: Convert to fraction form
   1,030.56/1,422.30 = 637.98/x
3. Step 3: Cross multiply
   1,030.56x = 1,422.30 × 637.98
4. Step 4: Simplify right side
   1,030.56x = 907,398.95
5. Step 5: Solve for x
   x = 907,398.95/1,030.56
6. Step 6: Final answer
   x = 880.49