Finding the Fourth Proportional to 2,591.61, 3,886.47 and 947.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.61 : 3,886.47 = 947.67 : x
2. Step 2: Convert to fraction form
   2,591.61/3,886.47 = 947.67/x
3. Step 3: Cross multiply
   2,591.61x = 3,886.47 × 947.67
4. Step 4: Simplify right side
   2,591.61x = 3,683,091.02
5. Step 5: Solve for x
   x = 3,683,091.02/2,591.61
6. Step 6: Final answer
   x = 1,421.16