Finding the Fourth Proportional to 2,124.69, 3,188.27 and 891.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.69 : 3,188.27 = 891.99 : x
2. Step 2: Convert to fraction form
   2,124.69/3,188.27 = 891.99/x
3. Step 3: Cross multiply
   2,124.69x = 3,188.27 × 891.99
4. Step 4: Simplify right side
   2,124.69x = 2,843,904.96
5. Step 5: Solve for x
   x = 2,843,904.96/2,124.69
6. Step 6: Final answer
   x = 1,338.50