Finding the Fourth Proportional to 1,039.87, 1,435.10 and 591.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.87 : 1,435.10 = 591.88 : x
2. Step 2: Convert to fraction form
   1,039.87/1,435.10 = 591.88/x
3. Step 3: Cross multiply
   1,039.87x = 1,435.10 × 591.88
4. Step 4: Simplify right side
   1,039.87x = 849,404.88
5. Step 5: Solve for x
   x = 849,404.88/1,039.87
6. Step 6: Final answer
   x = 816.84