Finding the Fourth Proportional to 2,631.90, 3,945.56 and 988.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.90 : 3,945.56 = 988.01 : x
2. Step 2: Convert to fraction form
   2,631.90/3,945.56 = 988.01/x
3. Step 3: Cross multiply
   2,631.90x = 3,945.56 × 988.01
4. Step 4: Simplify right side
   2,631.90x = 3,898,228.07
5. Step 5: Solve for x
   x = 3,898,228.07/2,631.90
6. Step 6: Final answer
   x = 1,481.15