Finding the Fourth Proportional to 2,591.25, 3,886.86 and 947.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,591.25 : 3,886.86 = 947.91 : x
2. Step 2: Convert to fraction form
   2,591.25/3,886.86 = 947.91/x
3. Step 3: Cross multiply
   2,591.25x = 3,886.86 × 947.91
4. Step 4: Simplify right side
   2,591.25x = 3,684,393.46
5. Step 5: Solve for x
   x = 3,684,393.46/2,591.25
6. Step 6: Final answer
   x = 1,421.86