Finding the Fourth Proportional to 2,087.16, 2,881.02 and 1,388.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.16 : 2,881.02 = 1,388.76 : x
2. Step 2: Convert to fraction form
   2,087.16/2,881.02 = 1,388.76/x
3. Step 3: Cross multiply
   2,087.16x = 2,881.02 × 1,388.76
4. Step 4: Simplify right side
   2,087.16x = 4,001,045.34
5. Step 5: Solve for x
   x = 4,001,045.34/2,087.16
6. Step 6: Final answer
   x = 1,916.98