Finding the Fourth Proportional to 2,591.49, 3,886.68 and 947.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.49 : 3,886.68 = 947.61 : x
2. Step 2: Convert to fraction form
   2,591.49/3,886.68 = 947.61/x
3. Step 3: Cross multiply
   2,591.49x = 3,886.68 × 947.61
4. Step 4: Simplify right side
   2,591.49x = 3,683,056.83
5. Step 5: Solve for x
   x = 3,683,056.83/2,591.49
6. Step 6: Final answer
   x = 1,421.21