Finding the Fourth Proportional to 1,030.89, 1,422.72 and 588.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.89 : 1,422.72 = 588.78 : x
2. Step 2: Convert to fraction form
   1,030.89/1,422.72 = 588.78/x
3. Step 3: Cross multiply
   1,030.89x = 1,422.72 × 588.78
4. Step 4: Simplify right side
   1,030.89x = 837,669.08
5. Step 5: Solve for x
   x = 837,669.08/1,030.89
6. Step 6: Final answer
   x = 812.57