Finding the Fourth Proportional to 1,010.58, 1,394.88 and 591.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.58 : 1,394.88 = 591.02 : x
2. Step 2: Convert to fraction form
   1,010.58/1,394.88 = 591.02/x
3. Step 3: Cross multiply
   1,010.58x = 1,394.88 × 591.02
4. Step 4: Simplify right side
   1,010.58x = 824,401.98
5. Step 5: Solve for x
   x = 824,401.98/1,010.58
6. Step 6: Final answer
   x = 815.77