Finding the Fourth Proportional to 2,590.71, 3,887.70 and 947.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,590.71 : 3,887.70 = 947.10 : x
2. Step 2: Convert to fraction form
   2,590.71/3,887.70 = 947.10/x
3. Step 3: Cross multiply
   2,590.71x = 3,887.70 × 947.10
4. Step 4: Simplify right side
   2,590.71x = 3,682,040.67
5. Step 5: Solve for x
   x = 3,682,040.67/2,590.71
6. Step 6: Final answer
   x = 1,421.25