Finding the Fourth Proportional to 3,910.42, 5,865.56 and 988.70

Step by Step Solution

1. Step 1: Write the proportion equation
   3,910.42 : 5,865.56 = 988.70 : x
2. Step 2: Convert to fraction form
   3,910.42/5,865.56 = 988.70/x
3. Step 3: Cross multiply
   3,910.42x = 5,865.56 × 988.70
4. Step 4: Simplify right side
   3,910.42x = 5,799,279.17
5. Step 5: Solve for x
   x = 5,799,279.17/3,910.42
6. Step 6: Final answer
   x = 1,483.03