Finding the Fourth Proportional to 2,591.90, 3,885.51 and 947.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.90 : 3,885.51 = 947.30 : x
2. Step 2: Convert to fraction form
   2,591.90/3,885.51 = 947.30/x
3. Step 3: Cross multiply
   2,591.90x = 3,885.51 × 947.30
4. Step 4: Simplify right side
   2,591.90x = 3,680,743.62
5. Step 5: Solve for x
   x = 3,680,743.62/2,591.90
6. Step 6: Final answer
   x = 1,420.09