Finding the Fourth Proportional to 2,087.90, 3,127.59 and 988.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.90 : 3,127.59 = 988.93 : x
2. Step 2: Convert to fraction form
   2,087.90/3,127.59 = 988.93/x
3. Step 3: Cross multiply
   2,087.90x = 3,127.59 × 988.93
4. Step 4: Simplify right side
   2,087.90x = 3,092,951.94
5. Step 5: Solve for x
   x = 3,092,951.94/2,087.90
6. Step 6: Final answer
   x = 1,481.37