Finding the Fourth Proportional to 1,077.75, 1,487.00 and 635.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.75 : 1,487.00 = 635.55 : x
2. Step 2: Convert to fraction form
   1,077.75/1,487.00 = 635.55/x
3. Step 3: Cross multiply
   1,077.75x = 1,487.00 × 635.55
4. Step 4: Simplify right side
   1,077.75x = 945,059.67
5. Step 5: Solve for x
   x = 945,059.67/1,077.75
6. Step 6: Final answer
   x = 876.88