Finding the Fourth Proportional to 2,124.22, 3,188.35 and 891.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.22 : 3,188.35 = 891.30 : x
2. Step 2: Convert to fraction form
   2,124.22/3,188.35 = 891.30/x
3. Step 3: Cross multiply
   2,124.22x = 3,188.35 × 891.30
4. Step 4: Simplify right side
   2,124.22x = 2,841,770.61
5. Step 5: Solve for x
   x = 2,841,770.61/2,124.22
6. Step 6: Final answer
   x = 1,337.79