Finding the Fourth Proportional to 2,151.63, 3,225.62 and 981.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.63 : 3,225.62 = 981.21 : x
2. Step 2: Convert to fraction form
   2,151.63/3,225.62 = 981.21/x
3. Step 3: Cross multiply
   2,151.63x = 3,225.62 × 981.21
4. Step 4: Simplify right side
   2,151.63x = 3,165,025.15
5. Step 5: Solve for x
   x = 3,165,025.15/2,151.63
6. Step 6: Final answer
   x = 1,470.99